Question

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

Explanation:

Step1: Align Protractor

Place the center of the protractor on vertex \( E \), align the base line of the protractor with one ray (e.g., \( EF \)).

Step2: Read Measurement

Read the angle where the other ray (\( ED \)) intersects the protractor. Visually, this angle appears to be \( 120^\circ \) (standard obtuse angle measurement for such a diagram).

Answer:

\( 120 \)