Question

an acute angles measure is:
a. exactly 90°.
b. between 0° and 90°.
c. between 90° and 180°.

Explanation:

To determine the measure of an acute angle, we recall the definitions:

• A right angle is exactly \(90^\circ\) (eliminating option A).
• An obtuse angle is between \(90^\circ\) and \(180^\circ\) (eliminating option C).
• An acute angle is defined as an angle whose measure is between \(0^\circ\) and \(90^\circ\), which matches option B.

Answer:

B. between \(0^\circ\) and \(90^\circ\)