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.

Step2: Make an estimate

By comparing with common - known angles (such as 90°, 120°, 135°, etc.), this angle seems to be around 105° which is within 15° of a reasonable estimate.

Answer:

105°