Question

which angle is supplementary to ∠adb?

Explanation:

Step1: Recall supplementary - angle definition

Two angles are supplementary if their sum is 180 degrees. Adjacent angles that form a straight - line are supplementary.

Step2: Identify the adjacent angle to ∠ADB

∠ADC and ∠ADB are adjacent angles and together they form a straight - line (a linear pair). So, ∠ADC+∠ADB = 180 degrees.

Answer:

∠ADC