## Angle Definition:

`An angle is the figure formed by`

two rays meeting at a common

end point called a vertex.

Write an angle using the ∠ symbol

Two rays,

BA and

BC intersect at vertex B to form the angle in the image

## 2 ways to refer to this angle:

∠ ABC

∠ B

## Angle Measurement:

Angles are measured using degrees.

## 6 types of angles:

0° ≤ Acute Angle < 90°

Right Angle measures 90°

90° < Obtuse Angle < 180°

Straight Angle measures 180°

180° < Reflex Angle < 360°

Complete Angle measures 360°

## Positive and Negative Angle Direction

## Positive Angles:

Positive angles go counter-clockwise

See +α in the picture above.

This is the

*opposite* direction that clocks go

## Negative Angles:

Negative angles go counter-clockwise

See -α in the picture above.

This is the

*same* direction that clocks go

##### How does the What is an Angle Calculator work?

Free What is an Angle Calculator - This lesson walks you through what an angle is and how to use it

### What 3 concepts are covered in the What is an Angle Calculator?

- angle
- the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
- geometry
- study of math dealing with shapes, space, and properties of space
- what is an angle

## What is an Angle Calculator Video

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