Question

what is an angle that is supplementary to ∠dea?

Explanation:

Step1: Recall supplementary - angle definition

Two angles are supplementary if their sum is 180 degrees.

Step2: Identify adjacent - angle to ∠DEA

Adjacent to ∠DEA is ∠DEB. Since ∠DEA+∠DEB = 180 degrees (a straight - line forms a 180 - degree angle), ∠DEB is supplementary to ∠DEA.

Answer:

∠DEB