CALCULUS Understanding Its Concepts and Methods

Angle measure,Radian measure,Degree

The angle subtended at the center of a circle by an arc of circumference equal in length to the radius of the circle is one radian.

There are 2π radians in a circle. There
are 360^{o} (degrees) in a circle. Thus 2π rad =
360^{o} and it follows
that

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Copyright © 2006 Darel Hardy, Fred Richman, Carol Walker, Robert Wisner. All rights reserved. Except upon the express prior permission in writing, from the authors, no part of this work may be reproduced, transcribed, stored electronically, or transmitted in any form by any method.