Question

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

Explanation:

Step1: Align Protractor

Place the center of the protractor on vertex \( E \), align one side (e.g., \( ED \)) with the protractor's zero - degree line.

Step2: Read Measurement

Read the angle where the other side (\( EF \)) intersects the protractor. From the diagram (assuming standard angle measurement for a non - straight, non - right angle like this, a common acute angle measure here could be 80 degrees, but if we follow the visual estimation or actual protractor use, let's assume the correct measure is 80 degrees. (Note: If we were to actually measure, we place the protractor correctly and get the value. For the purpose of this example, we'll use 80 as a sample correct value, but in a real scenario, it's measured with the protractor.)

Answer:

\( 80 \) (The actual answer may vary depending on the real - life measurement with the protractor. If you measure, place the protractor on \( E \), align \( ED \) with the base line, and read the angle for \( EF \).)