# How to Find the Perimeter of a Triangle With an Unknown Variable?

The perimeter of a triangle is the sum of the lengths of all of its 3 sides. If you know 2 of the side lengths of a triangle and the angle between the two, you can calculate the length of the third...
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http://www.ehow.com/how_8380584_perimeter-triangle-unknown-variable.html

## How to Find the Perimeter of a Triangle?

The "perimeter" is the distance around a closed plane. In this article, you will learn how to calculate the perimeter of a triangle in four easy steps.

http://www.wikihow.com/Find-the-Perimeter-of-a-Triangle

## How to Find the Perimeter of a Isosceles Triangle?

It is easy to calculate an isosceles triangle's perimeter because it is a simple shape. A triangle, also known as a trigon, is a polygon with three interior angles and three sides. Triangles are cl...
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http://www.ehow.com/how_8412346_perimeter-isosceles-triangle.html

## 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