# Spectrum Math Grade 4 Chapter 7 Lesson 15 Answer Key Measuring Angles

This handy Spectrum Math Grade 4 Answer Key Chapter 7 Lesson 7.15 Measuring Angles provides detailed answers for the workbook questions.

## Spectrum Math Grade 4 Chapter 7 Lesson 7.15 Measuring 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 is a right angle.

Explanation:
A right angle measures exactly 90°.
So the given figure is a right angle as it measures 90°.

b.

Type of Angle _____________
The type of Angle is an acute angle.

Explanation:
An acute angle measures less than 90°.

Question 2.
a.

Type of Angle _____________
The type of Angle is called an obtuse angle.

Explanation:
An obtuse angle measures greater than 90° but less than 180°.

b.

Type of Angle _____________
The type of Angle is an acute angle.

Explanation:
An acute angle measures less than 90°.

Question 3.
a.

Type of Angle _____________
The type of Angle is a right angle.

Explanation:
A right angle measures exactly 90°.
So the given figure is a right angle as it measures 90°.

b.

Type of Angle _____________