Question

estimate the measure of this angle within 15°.

Explanation:

Step1: Compare with known angles

We know that a right - angle is 90°, a 45° angle has two arms that form a square - like slant. This angle is less than 45°.

Step2: Make an estimate

By visual inspection, it seems to be around 30°. Since we need to estimate within 15°, values from 15° to 45° would be reasonable estimates. A good estimate is 30°.

Answer:

30