Question

Which angles are complementary to each other? Select all that apply.

Answer 1

∠1 and ∠2

Explanation:

Angle 1 and Angle 2 are the only complementary angles because they form a right angle, which is worth 90°.

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Answer 2

Answer: Choice A only

Angles 1 and 2 add to 90 degrees, ie they join to form a right angle.

Put another way, angles 1,2, and 3 form a straight angle (180 degrees). Angle 3 is 90 degrees, so angles 1 and 2 make up the other 90.