Question

two angles that add to 180° are called:
supplementary angles
acute angles
complementary angles
obtuse angles

Explanation:

To determine the correct term for two angles that add up to \(180^\circ\), we analyze each option:

• "Acute angles" are angles less than \(90^\circ\), so this is incorrect.
• "Complementary angles" are two angles that add up to \(90^\circ\), so this is incorrect.
• "Obtuse angles" are angles greater than \(90^\circ\) but less than \(180^\circ\), so this is incorrect.
• "Supplementary angles" are defined as two angles whose sum is \(180^\circ\), so this matches the description.

Answer:

Supplementary angles