Question

estimate the measure of this angle within 10°.

Explanation:

Step1: Recall angle - types

A right - angle is $90^{\circ}$.

Step2: Observe the angle

The given angle is less than a right - angle.

Step3: Make an estimate

It looks about $70^{\circ}$ (since it is clearly more than $60^{\circ}$ and less than $80^{\circ}$).

Answer:

$70^{\circ}$