Question

use the protractor to measure the angle. hide ∠ def = \boxed{} ^\circ

Explanation:

Step1: Align Protractor

Align the center of the protractor with vertex \( E \), and align the zero - degree mark of the protractor with ray \( ED \).

Step2: Read the Angle

Look at the position of ray \( EF \) on the protractor. The scale on the protractor shows that the angle between \( ED \) and \( EF \) is \( 30^\circ \).

Answer:

\( 30 \)