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Two acute angles are called complementary if their sum is:

A. A right angle
B. Less than 90°
C. Equal to 180°
D. Greater than 90°


Sagot :

To solve the question of when two acute angles are called complementary, we need to understand the definition of complementary angles.

1. Understanding Complementary Angles:
Complementary angles are two angles whose measures add up to a specific value.

2. Sum of Complementary Angles:
By definition, the sum of two complementary angles is a specific angle measurement.

3. Identifying the Specific Angle:
A right angle is measured as 90°. Therefore, two angles are complementary if their measures add up to a right angle.

So, two acute angles are called complementary if their sum is a right angle.

Hence, the correct answer is:
- A right angle