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MatematikaRia.com

# Degrees (Angles)

### We can measure Angles in Degrees.

There are 360 degrees in one Full Rotation (one complete circle around).

(Angles can also be measured in Radians)

(Note: "Degrees" can also mean Temperature, but here we are talking about Angles)

## The Degree Symbol: °

We use a little circle ° following the number to mean degrees.

For example 90° means 90 degrees

## One Degree

This is how large 1 Degree is

## The Full Circle

A Full Circle is 360°

Half a circle is 180°
(called a Straight Angle)

Quarter of a circle is 90°
(called a Right Angle)

 Why 360 degrees? Probably because old calendars (such as the Persian Calendar) used 360 days for a year - when they watched the stars they saw them revolve around the North Star one degree per day.

## Measuring Degrees

We often measure degrees using a protractor:

The normal protractor measures 0° to 180°

 You can also get full-circle protractors. But they are not as commonly used because they are a bit big and don't do anything special.