# Spectrum Math Grade 5 Chapter 9 Lesson 4 Answer Key Classifying Angles

Practice with the help of Spectrum Math Grade 5 Answer Key Chapter 9 Lesson 9.4 Classifying Angles regularly and improve your accuracy in solving questions.

## Spectrum Math Grade 5 Chapter 9 Lesson 9.4 Classifying Angles Answers Key

A protractor is used to measure an angle. The angle is measured in degrees.

A right angle measures exactly 90°.
An acute angle measures less than 90°.
An obtuse angle measures greater than 90° but less than 180°.

Identify each angle as right, acute, or obtuse.

Question 1.
a.

Type of Angle ______________
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.

b.

Type of Angle ______________
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.

Question 2.
a.

Type of Angle ______________
The type of angle in the above figure is obtuse angle.
An obtuse angle measures greater than 90° but less than 180°.

b.

Type of Angle ______________
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.

Question 3.
a.

Type of Angle ______________
The type of angle in the above figure is right angle.
A right angle measures exactly 90°.

b.

Type of Angle ______________
The type of angle in the above figure is obtuse angle.
An obtuse angle measures greater than 90° but less than 180°.

Use a protractor to measure each angle. Then, label each angle right, acute, or obtuse.

Question 1.
a.

∠ ____________ = ____________
Answer: ∠ ABC = 60 degrees
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.

b.

∠ ____________ = ____________
Answer: ∠ GHI = 90 degrees
The type of angle in the above figure is right angle.
A right angle measures exactly 90°.

Question 2.
a.

∠ ____________ = ____________
Answer: ∠ PQR = 110 degrees
The type of angle in the above figure is obtuse angle.
An obtuse angle measures greater than 90° but less than 180°.

b.

∠ ____________ = ____________
Answer: ∠ XYZ = 170 degrees
The type of angle in the above figure is obtuse angle.
An obtuse angle measures greater than 90° but less than 180°.

Question 3.
a.

∠ ____________ = ____________
Answer: ∠ 123 = 90 degrees
The type of angle in the above figure is right angle.
A right angle measures exactly 90°

b.

∠ ____________ = ____________
Answer: ∠ ABC = 30 degrees
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.

Find the measure of each angle of the given triangle. Label each angle as right, acute, or obtuse.

Question 4.
a.

∠ ____________ = ____________
It is _______________.
∠ ____________ = ____________
It is _______________.
∠ ____________ = ____________
It is _______________.
∠ ABC = 60 degrees
It is Acute angle.
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.
∠BCA = 60 degrees
It is Acute angle.
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.
∠ CAB= 60 degrees
It is Acute angle.
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.

b.

∠ ____________ = ____________
It is _______________.
∠ ____________ = ____________
It is _______________.
∠ ____________ = ____________
It is _______________.
∠ XYZ = 90 degrees
It is Right angle.
The type of angle in the above figure is right angle.
A right angle measures exactly 90°
∠ YZX = 45 degrees
It is Acute angle.
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.
∠ ZXY = 45 degrees
It is Acute angle.
The type of angle in the above figure is acute angle.
An acute angle measures less than 90°.

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