Question

what are supplementary angles? angles that are equal to each other angles that add up to 180° angles that add up to 90° angles that are opposite of each other when lines intersect

Explanation:

Step1: Recall the definition of supplementary angles

Supplementary angles are two angles whose sum is \(180^{\circ}\).

Step2: Analyze each option

• Angles that are equal to each other are called congruent angles, not supplementary angles.
• Angles that add up to \(90^{\circ}\) are called complementary angles.
• Angles that are opposite of each other when lines intersect are called vertical angles.
• Angles that add up to \(180^{\circ}\) match the definition of supplementary angles.

Answer:

Angles that add up to \(180^{\circ}\)