Degrees (Angles)

We can measure Angles in Degrees.

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

(Angles tin besides be measured in Radians)

(Note: "Degrees" can as well hateful Temperature, just hither we are talking near Angles)

The Degree Symbol: °

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

For example ninety° means 90 degrees

One Degree

1 Degree
This is how big 1 Degree is

Full Circle Degrees

The Full Circle

A Full Circle is 360°

One-half a circle is 180°
(called a Directly Angle)

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

question

Why 360 degrees? Probably considering old calendars (such as the Western farsi Calendar) used 360 days for a year - when they watched the stars they saw them revolve effectually the North Star one degree per twenty-four hour period.

Also 360 can be divided exactly by two, 3, 4, 5, 6, 8, 9, ten, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120 and 180, which makes a lot of basic geometry easier.

Measuring Degrees

Nosotros often measure degrees using a protractor:

Protractor
The normal protractor measures 0° to 180°

Full Circle Protractor

At that place are also full-circle protractors.

But they are not equally ordinarily used considering they are a bit big and don't do annihilation special.