CALCULUS Understanding Its Concepts and Methods

Triangles

A triangle is a three-sided figure whose sides are straight lines. A point where two sides intersect is called a vertex of the triangle.

The sum of the angles of a triangle is . A triangle is acute if all its angles are less than , obtuse if one angle is greater than , and a right triangle if one angle is equal to .

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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.