Question

estimate the measure of this angle within 10°.

Explanation:

Step1: Recall angle - type knowledge

A right - angle is 90°.

Step2: Observe the given angle

The given angle is less than 90°.

Step3: Make an estimate

By comparing with common - known angles (like 30°, 45°, 60°), it appears closer to 60° within a 10° tolerance.

Answer:

60°