CALCULUS Understanding Its Concepts and Methods
Rectangle, Square
A rectangle is a four-sided figure whose sides are straight lines and whose angles are right angles.
A square is a rectangle whose sides are all equal.
Let
l = length,
w =
width, and d
=
diagonal.
The perimeter of a rectangle is the sum of its sides: P = 2l + 2w
The area of a rectangle is its length times its width: A = lw
The diagonal of a rectangle is the square root of the sum of the squares of its length and width.
Example: The perimeter of a rectangle of width and length is and its area is
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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.