Quick Reference ~ A maths Dictionary for Kids by Jenny Eather Email jeather@iprimus.com.au A Maths Dictionary for Kids by Jenny Eather at www.amathsdictionaryforkids.com


Rr

radian

• the angle made at the centre of a circle by an arc equal
to the radius wrapped around the circumference.
• the size of the radian remains constant
whatever the size of the circle.
• symbol rad or c.

radians = degrees x 180/pi
degrees = radians x pi/180

EXAMPLES:
radian
radian animation
from
https://commons.wikimedia.org/wiki/File:Circle_radians.gif


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