Question

estimate the measure of this angle within 15°.

Explanation:

Step1: Recall angle - type knowledge

We know that a right - angle is 90°, an acute angle is less than 90° and an obtuse angle is greater than 90°. The given angle is acute.

Step2: Make an estimate

A 45° angle has two arms that form a symmetric 'V' shape. The given angle is a bit less than 45°. We can estimate it to be around 45° - 15° = 30°.

Answer:

30°