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Similar triangles

If $AB$ and $CD$ are lines, then the ratio of $AB$ to $CD $, written $AB:CD$, is the length of $AB$ divided by the length of $CD$.

The sides of $\Delta ABC$ are proportional to the sides of $\Delta DEF$ if the three ratios $AB:DE$, $BC:EF$, and $CA:FD$ are equal.

Two triangles are similar if their angles are equal and their sides are proportional.

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Ratio and Proportion


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Altitude of a triangle

Bisectors

Law of cosines

Law of sines

Median

Pythagorean theorem

Triangle


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.

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