Question

estimate the measure of this angle within 15°.

Explanation:

Step1: Recognize angle type

It is an obtuse - angle.

Step2: Use reference angles

A right - angle is 90°. This angle looks like it is 45° more than a right - angle. So 90 + 45=135°. 135° is within the required 15° estimate range for this type of visual estimation.

Answer:

135