What do you call two angles that add up to 90 degrees?

What do you call two angles that add up to 90 degrees?

• A. Supplementary
• B. Complementary
• C. Adjacent
• D. Vertical

Answer: (B)

Two angles that add up to 90 degrees are referred to as complementary angles. The term "complementary" specifically denotes this relationship, meaning that when measured together, the sum of their angle measures equals a right angle. This concept is essential in geometry, especially when dealing with right triangles and various geometric figures where angles interact. The relationship is significant in various mathematical applications and helps in solving problems involving right angles, such as in trigonometry and other fields involving angle measures. Understanding that complementary angles can exist as two angles that are not adjacent, or even in different orientations, reinforces the versatility of this concept across different mathematical contexts. This identification of angles is foundational in geometry and often comes into play when solving problems or proving theorems, making the understanding of complementary angles an important aspect of mathematical reasoning.

Two angles that add up to 90 degrees are referred to as complementary angles. The term "complementary" specifically denotes this relationship, meaning that when measured together, the sum of their angle measures equals a right angle. This concept is essential in geometry, especially when dealing with right triangles and various geometric figures where angles interact.

The relationship is significant in various mathematical applications and helps in solving problems involving right angles, such as in trigonometry and other fields involving angle measures. Understanding that complementary angles can exist as two angles that are not adjacent, or even in different orientations, reinforces the versatility of this concept across different mathematical contexts.

This identification of angles is foundational in geometry and often comes into play when solving problems or proving theorems, making the understanding of complementary angles an important aspect of mathematical reasoning.