Question

which of the following is the measure of an acute angle?
a. 89°
b. 122°
c. 97°
d. 270°

Explanation:

Step1: Recall acute - angle definition

An acute angle is an angle whose measure is greater than 0° and less than 90°.

Step2: Check each option

• Option A: 89° is greater than 0° and less than 90°.
• Option B: 122° is greater than 90°, so it is an obtuse angle.
• Option C: 97° is greater than 90°, so it is an obtuse angle.
• Option D: 270° is a reflex angle.

Answer:

A. 89°