Question

estimate the measure of this angle within 15°.

Explanation:

Step1: Observe the angle

The angle is acute. A right - angle is 90°. This angle is much less than 90°.

Step2: Make an estimate

By comparing with common - known angles like 30° and 45°, we can estimate that the angle is around 45°. Since we need to estimate within 15°, the range is from 30° to 60°. A reasonable estimate is 45°.

Answer:

45°