# How to Solve the Unknown Variable of Triangles?

Depending on their configuration, triangles offer several methods for finding a unknown side's length. If the triangle has a right angle, you can use the Pythagorean theorem, which relates the thre...
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http://www.ehow.com/how_8518320_solve-unknown-variable-triangles.html

## How to Solve the Unknown Variable of Triangles With Parallel Lines & Theorems?

There are several theorems in geometry that describe the relationship of angles formed by a line that transverses two parallel lines. If you know the measures of some of the angles formed by the tr...
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http://www.ehow.com/how_8675892_solve-triangles-parallel-lines-theorems.html

## How to Find a Variable in Congruent Triangles?

Two triangles are congruent if they have the same angles and their sides are the same length. They do not have to be in the same position; you can take two equilateral triangles with sides each equ...
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http://www.ehow.com/how_8504283_variable-congruent-triangles.html

## How to Solve for One Variable in Terms of Another Variable?

An equation with multiple variables, or a multivariate equation, is as dependent on those variables as the variables are on each other. Often, as with a system of linear equations or solution of a ...
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http://www.ehow.com/how_8112755_solve-variable-terms-another-variable.html

## How to Find an Unknown Side of Similar Triangles?

Although two similar shapes may be different sizes, they have the same form. All of the corresponding angles in two similar triangles have the same measure and their corresponding sides are proport...
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http://www.ehow.com/how_8177757_unknown-side-similar-triangles.html