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Classifying Angles

Site: Saylor Academy
Course: GKT101: General Knowledge for Teachers – Math
Book: Classifying Angles
Printed by: Guest user
Date: Tuesday, July 1, 2025, 4:20 AM

Description

Often, the angles are described based on their degree measure: they can be acute, right, or obtuse. Watch this lecture series and complete the exercises to practice identifying different types of angles.

Table of contents

Acute, right, & obtuse angles

Recognizing angles


Drawing acute, right and obtuse angles


Practice

   

Angle types - Questions

1. Is the following angle acute, right, obtuse, or straight?



Choose 1 answer:

(A) Acute angle

(B) Straight angle

(C) Right angle

(D) Obtuse angle

2. Is the following angle acute, right, obtuse, or straight?



Choose 1 answer:

(A) Right angle

(B) Acute angle

(C) Straight angle

(D) Obtuse angle

3. What type of angle is \(\angle A B C\)?



Choose 1 answer:

(A) Straight angle

(B) Right angle

(C) Obtuse angle

(D) Acute angle

4. What type of angle is \(\angle Q R S\)?



Choose 1 answer:

(A) Right angle

(B) Straight angle

(C) Obtuse angle

(D) Acute angle


Angle types - Answers

1. The angle shown makes a square corner.

Therefore, it is a right angle.

2. The angle shown is smaller than a right angle.

Therefore, it is an acute angle.

3. \(\angle A B C\) is an acute angle.

4. \(\angle Q R S\) is a straight angle.


Recognize angles in figures - Questions

1. What type of angle is the highlighted angle below?



Choose 1 answer:

(A) Acute angle

(B) Obtuse angle

(C) Right angle

2. Which of the angles in the diagram are acute angles?


Choose all answers that apply:

(A) \(\angle 1\)

(B) \(\angle 2\)

(C) \(\angle 3\)

(D) \(\angle 4\)

3. What type of angle is \(\angle A\)?



Choose 1 answer:

(A) Obtuse angle

(B) Right angle

(C) Acute angle

4. What type of angle is the highlighted angle below?



Choose 1 answer:

(A) Acute angle

(B) Obtuse angle

(C) Right angle

Recognize angles in figures - Answers

1. The highlighted angle is an obtuse angle.

2. \(\angle 2\) and \(\angle 4\) are acute angles.

3. \(\angle A\) ais an acute angle.

4. The highlighted angle is an obtuse angle.