Common Core Math Vocabulary

# Acute Angle - Definition with Examples

## Let's learn!

**What is an acute angle?**

In geometry, an acute angle is an angle which measures less than 90 degrees (90°).

Here, ∠PQR measures 45 degrees (45°) and thus, is an acute angle.

We can find an acute angle in a stapler, a pair of scissors, and in a geometric compass, around us.

## Let's sing!

*Acute angles are the small ones! You see!*

*They are always smaller than 90 degrees.*

## Let's do it!

Instead of handing out math geometry worksheets on angles, ask children to observe/spot things around them in which they can see acute angles.

You can also ask them to make acute angles using their arms and fingers.

## Related math vocabulary

The Complete K-5 Math Learning Program Built for Your Child