Question

what is the measurement of this angle?

Explanation:

Step1: Identify vertex and baseline

The vertex is at the protractor center, one side aligns with the 90° vertical mark, the other points to 30° on the left outer scale.

Step2: Calculate angle difference

Subtract the two scale values to find the angle.
$\text{Angle} = 90^\circ - 30^\circ$

Answer:

$60^\circ$