# Angle - Definition with Examples

## Let's learn!

**What is an angle?**

An angle is represented by the symbol ∠. Here, the angle below is ∠AOB.

Angles are measured in degrees, using a protractor.

**Parts of an Angle:**

Vertex: The common end point at which the two rays meet to form an angle is called the vertex. Here, the point O is the vertex of ∠AOB.

We can find angles in various things around us, such as in a pair of scissors, a hockey stick, a chair.

**Types of Angles**

Angles can be classified on the basis of their measurements as

- Acute Angles - Right Angles - Obtuse Angles

- Straight Angles - Reflex Angles - Complete Angles

**Interior and Exterior Angles:**

Exterior angles: Exterior angles are the angles formed outside between any side of a shape, and a line extended from the adjoining side. Here, ∠ACD is an exterior angle.

## Let's sing!

*An acute angle is a little so small,*

*Right angle in the corner of a wall,*

*Obtuse angle at 2:50 in day-time,*

*Straight angle in a straw in soda-lime!*

*So many angles all around, even in a mime!*

## Let's do it!

Instead of handing out geometry angles worksheets to your children, ask your child to observe/spot the things in which they can find different angles such as in a hanger, hands of a clock, or the roof a house.

## Related math vocabulary

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