Question

estimate the measure of this angle within 15°.

Explanation:

Step1: Recall angle - type knowledge

An acute angle is less than 90°, a right - angle is 90°, and an obtuse angle is between 90° and 180°. This angle is obtuse.

Step2: Make an estimate

We know that a 90° angle is a square - corner and a 180° angle is a straight line. This angle looks to be around 135°. We can check if it is within 15° accuracy. 135° is a reasonable estimate as it is clearly more than 90° and less than 180°.

Answer:

135