estimate the measure of this angle within 10°. angle diagram

Explanation:

Step1: Recall angle types

A right angle is (90^\circ), acute is less, obtuse more. This angle is acute.

Step2: Compare to known angles

The angle looks like it's about (60^\circ) (within (10^\circ) of (60^\circ), so (50^\circ - 70^\circ) range, but a common estimate is (60^\circ)).

Answer:

(60^\circ) (or within (10^\circ) of (60^\circ), e.g., (50^\circ - 70^\circ) range, but a typical estimate is (60^\circ))