Question

Which angles are supplementary to <4? Select all that apply.

Answer 1

(c) ∠3

Explanation:

You want to know the angles supplementary to ∠4 in the figure.

Supplementary

In this geometry, only angles that are a linear pair are supplementary. The linear pairs involving angle 4 are ...

• ∠1 and ∠4
• ∠3 and ∠4

Of these, ∠3 is one of your answer choices.

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Additional comment

Other pairs of angles would be supplementary if there were parallel lines. Here, none of the lines are parallel, so those relations do not apply.