Question

estimate the measure of this angle within 15°.

Explanation:

Step1: Recall angle - type knowledge

A right - angle is 90°. This angle is larger than a right - angle but less than a straight - angle (180°).

Step2: Make an estimate

We can estimate this angle to be around 120°. Since we need to estimate within 15°, values in the range of 105° - 135° are acceptable estimates. A common estimate could be 120°.

Answer:

120