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Mcgraw hil Chapter 12 Study Guide and Review Continued Algebra 2 Answers

All the solutions provided inMcGraw Hill My Math Grade 5 Answer Key PDF Chapter 12 Lesson 2 Sides and Angles of Triangles will give you a clear idea of the concepts.

McGraw-Hill My Math Grade 5 Answer Key Chapter 12 Lesson 2 Sides and Angles of Triangles

A triangle is a polygon with three sides and three angles.

Measure It

Measure the sides of each pair of triangles below to the nearest tenth of a centimetre. Then record the measures.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 1
Answer:
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_1

Talk About It

Question 1.
Compare the side lengths of each pair of triangles above. What do you notice?
Answer:
Now we have to compare the above diagram and its measurements:
Pair A:
In pair A, the two triangles have equal sides. So it is said to be all sides are congruent.
In pair B, two sides are congruent.
In pair C, no sides are congruent.

Try It

Measure the angles of each pair of triangles below to the nearest degree. Then record the measures.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 2
Answer:
Take the protector and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_2

Talk About It

Question 2.
Compare the angle measures of each pair of triangles above. What do you notice?
Answer:
From the above diagram and the angles measured we noticed that:
In pair A: Each has one right angle
In pair B: Each has one obtuse angle.
Obtuse triangle: An obtuse-angled triangle or obtuse triangle is a type of triangle whose one of the vertex angles is bigger than 90°. An obtuse-angled triangle has one of its vertex angles as obtuse and other angles as acute angles i.e. if one of the angles measures more than 90°, then the sum of the other two angles is less than 90°. The side opposite to the obtuse angle is considered the longest.
In pair C: All are acute angles.
Acute triangle: An acute triangle is a triangle in which all three interior angles are less than 90º. Although the three interior angles of the acute triangle lie between 0° to 90°, their sum is always 180 degrees.

Question 3.
Mathematical PRACTICE Make Sense of Problems Explain how a triangle is a special kind of polygon.
Answer: Triangle is a special kind of polygon as it is a polygon that can be formed using the least number of sides which are required to form a polygon. The minimum number of straight lines required to form a polygon is 3 and a polygon formed with it is called a triangle.
Here we need to show why a triangle is a special kind of a polygon. A polygon is any two-dimensional shape that is made by using straight lines and the shape so formed must be a close shape. Hence we must know the minimum of three sides that can be used. So the polygon that can be formed using such three sides can be a triangle. McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_7

Practice It

Measure the sides of each triangle to the nearest tenth of a centimetre. Then describe the number of congruent sides.

Question 4.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 3
Answer:
Take the scale and measure the sides of the given triangle
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_3
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
All sides are having the same measurement which is 2 centimetres.
Therefore, the triangle has 3 congruent sides.

Question 5.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 4
Answer:
Take the scale and measure the sides of the given triangle.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_4
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
Two sides are having the same measurement which is 3 centimetres.
Therefore, the triangle has 2 congruent sides.

Question 6.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 5
Answer:
Take the scale and measure the sides of the given triangle.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_5
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
No sides are having the same measurement.
Therefore, the triangle has no congruent sides.

Question 7.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 6
Answer:
Take the scale and measure the sides of the given triangle.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_6
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
No sides are having the same measurement.
Therefore, the triangle has no congruent sides.

Measure the angles of each triangle to the nearest degree. Then describe the number of acute, right, or obtuse angles.

Question 8.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 7
Answer:
Here take a protractor and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_8
we need to write the number of obtuse, right and acute angles. Observe the diagram and its measurements.
From the above diagram, we can say that the triangle has one obtuse angle and 2 acute angles.
Obtuse angle: "an obtuse angle is an angle which is greater than 90° and less than 180°". In other words, an obtuse angle is between a right angle and a straight angle.
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Question 9.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 8
Answer:
Here take a protractor and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_9
we need to write the number of obtuse, right and acute angles. Observe the diagram and its measurements.
From the above diagram, we can say that the triangle has one right angle and 2 acute angles.
Right angle: If the measure of the angle between two rays is exactly equal to 90 degrees or π/2, then the angle is called a right angle.
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Question 10.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 9
Answer:
Here take a protractor and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_10
we need to write the number of obtuse, right and acute angles. Observe the diagram and its measurements.
From the above diagram, we can say that the triangle has 3 acute angles.
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Question 11.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 10
Answer:
Here take a protractor and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_11
we need to write the number of obtuse, right and acute angles. Observe the diagram and its measurements.
From the above diagram, we can say that the triangle has one obtuse angle and 2 acute angles.
Obtuse angle: "an obtuse angle is an angle which is greater than 90° and less than 180°". In other words, an obtuse angle is between a right angle and a straight angle.
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Apply It

Question 12.
In music, the "triangle is an instrument with three congruent sides. If you know that the perimeter of the triangle is 18 inches, what is the measure of one side?
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 11
Answer:
The above-given:
The perimeter of a triangle = 18
we need to find out the measure of one side.  Let it be S.
The sum of the lengths of the sides is the perimeter of any polygon. In the case of a triangle,
Perimeter = Sum of the three sides
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_12
The triangle has 3 sides. so divide the perimeter and number of sides of the triangle to get the answer.
S = 18 / 3
S = 6
Therefore, the measure of one side is 6 inches.

Question 13.
Mathematical PRACTICE Use Math Tools Measure the angles in the triangle shown. What type(s) of angles are in the triangle shown?
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 12
Answer: Acute angle
Explanation:
Take a protractor and measure the angle. It is less than 90 degrees.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_13
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Question 14.
Refer to Exercise 13. Measure the sides of the triangle. Then describe the number of congruent sides.
Answer:
Take a scale and measure the triangle given
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_14
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
Two sides are having the same measurement which is 3 centimetres.
Therefore, the triangle has 2 congruent sides.

Question 15.
Mathematical PRACTICE Which One Doesn't Belong? Circle the triangle that does not belong with the other three. Explain your reasoning.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 13
Answer:
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_15
It is the only triangle that does not have at least two congruent sides.

Write About It

Question 16.
How are all triangles the same and how can they be different?
Answer:
Two triangles will be similar if the angles are equal (corresponding angles) and the sides are in the same ratio or proportion (corresponding sides). Similar triangles may have different individual lengths of the sides of triangles but their angles must be equal and their corresponding ratio of the length of the sides must be the same. They can differ in the number of congruent sides and angles measures.

McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 My Homework Answer Key

Practice

Measure the sides of each triangle to the nearest tenth of a centimetre. Then describe the number of congruent sides.

Question 1.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 14
Answer:
Take a scale and measure the triangle given.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_16
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
Two sides are having the same measurement which is 2.4 centimetres.
Therefore, the triangle has 2 congruent sides.

Question 2.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 15
Answer:
Take a scale and measure the triangle given.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_17
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
No sides are having the same measurement.
Therefore, the triangle has no congruent sides.

Measure the angles of each triangle to the nearest degree. Then describe the number of acute, right, or obtuse angles.

Question 3.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 16
Answer:
Take the protractor and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_18
we need to write the number of obtuse, right and acute angles. Observe the diagram and its measurements.
From the above diagram, we can say that the triangle has 3 acute angles.
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Question 4.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 17
Answer:
Take the protractor and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_19
we need to write the number of obtuse, right and acute angles. Observe the diagram and its measurements.
From the above diagram, we can say that the triangle has one obtuse angle and 2 acute angles.
Obtuse angle: "an obtuse angle is an angle which is greater than 90° and less than 180°". In other words, an obtuse angle is between a right angle and a straight angle.
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Problem Solving

Question 5.
Measure the sides of the triangle shown. How many sides of the triangle are congruent?
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 18
Answer:
Take the scale and measure the sides of the above-given triangle
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_20
Here we need to write the number of congruent sides also.
Now observe the triangle and its measurements:
Two sides are having the same measurement which is 3 centimetres.
Therefore, the triangle has 2 congruent sides.

Question 6.
Refer to the triangle in Exercise 5. Measure the angles of the triangle shown. How many angles of the triangle are congruent?
Answer:
Take the protractor and measure the angles.
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_21
we need to write the number of obtuse, right and acute angles. Observe the diagram and its measurements.
From the above diagram, we can say that the triangle has one obtuse angle and 2 acute angles.
Therefore, 2 angles are congruent.
Obtuse angle: "an obtuse angle is an angle which is greater than 90° and less than 180°". In other words, an obtuse angle is between a right angle and a straight angle.
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).

Question 7.
In billiards, a rack is used to organize billiard balls at the beginning of the game. Jason is making the wood rack and found that each angle is congruent and that the sum of the angles is 180°. What is the measure of each angle?
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 19
Answer:
The above-given:
The sum of angles = 180 degrees.
We need to measure each angle. Let it be A.
The triangle has 3 sides and 3 angles.
A = 180 / 3
A = 60
Therefore, each angle measures 60 degrees.

Question 8.
Measure each angle of the triangle. How many acute angles does the triangle have?
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles 20
Answer:
The triangle has 3 sides and 3 angles.
We need to write the number of acute angles the triangle has.
The diagram and angles measured are shown below:
McGraw Hill My Math Grade 5 Chapter 12 Lesson 2 Answer Key Sides and Angles of Triangles_22
Acute angles: An angle which is measuring less than 90 degrees is called an acute angle. This angle is smaller than the right angle (which is equal to 90 degrees).
The angle measured is 45 degrees.
Therefore, there are two acute angles.

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