# Spectrum Math Grade 4 Chapter 7 Lesson 17 Answer Key Finding Missing Angles

This handy Spectrum Math Grade 4 Answer Key Chapter 7 Lesson 7.17 Finding Missing Angles provides detailed answers for the workbook questions.

## Spectrum Math Grade 4 Chapter 7 Lesson 7.17 Finding Missing Angles Answers Key

To find the missing angle in a straight angle, subtract the given angle from 180°.

The missing angle is 53°.

To find the missing angle in a right angle, subtract the given angle from 90°.

The missing angle is 65°.

Find the value of the missing angles.

Question 1.
a.

The value of the missing angle is 45°.

Explanation:
To find the missing angle in a straight angle, subtract the given angle from 90°.
90° – 45° = 45°

The missing angle is 45°.

b.

The value of the missing angle is 75°.

Explanation:
To find the missing angle in a straight angle, subtract the given angle from 180°.
180° – 105° = 75°

Question 2.
a.

The value of the missing angle is 68°.

Explanation:
To find the missing angle in a straight angle, subtract the given angle from 90°.
90° – 22° = 68°

b.

The value of the missing angle is 75°.

Explanation:
To find the missing angle in a straight angle, subtract the given angle from 90°.
90° – 15° = 75°.

Question 3.
a.

The value of the missing angle is 88°.

Explanation:
To find the missing angle in a straight angle, subtract the given angle from 180°.
180°.-92°.=88°.

b.

The value of the missing angle is 28°.

Explanation:
To find the missing angle in a straight angle, subtract the given angle from 90°.
90°-62°=28°

Question 4.
a.

The value of the missing angle is 17°.

Explanation:
To find the missing angle in a straight angle, subtract the given angle from 180°.
180° – 163° = 17°

b.