Question

Which of the following is an acute angle?

• A. ${98}^{\circ }$
• B. ${89}^{\circ }$
• C. ${179}^{\circ }$
• D. ${181}^{\circ }$

Answer 1

The correct option is B ${89}^{\circ }$

An angle that measures less than ${90}^{\circ }$ is called an acute angle.

Thus, the angle ${89}^{\circ }$ is acute.

Angles that are greater than ${90}^{\circ }$ and less than ${180}^{\circ }$ are called obtuse angles.

Thus, ${98}^{\circ }$ and ${179}^{\circ }$ are obtuse angles.

An angle that measures greater than ${180}^{\circ }$ and less than ${360}^{\circ }$ is called a reflex angle.

Thus, ${181}^{\circ }$ is a reflex angle.