Question

use the protractor to measure the angle. ∠ def = °

Explanation:

Step1: Align Protractor

Place the center of the protractor on vertex \( E \), align the baseline of the protractor with one side of the angle (e.g., \( ED \)).

Step2: Read Measurement

Read the angle where the other side ( \( EF \)) intersects the protractor scale. Assuming the angle is acute, a common measurement here (visually estimated) is \( 50^\circ \) (actual measurement depends on precise alignment, but typical for such a diagram).

Answer:

\( 50 \) (Note: Actual measurement may vary slightly based on protractor use, but this is a common estimate for the given angle diagram.)