Find the third side of a triangle

This can be a great way to check your work or to see how to Find the third side of a triangle.


How to Determine the Length of the Third Side of a Triangle

Using the Pythagorean Theorem formula for right triangles you can find the length of the third side if you know the length of any two other sides. Read below to see solution formulas derived from the Pythagorean Theorem
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How to find the third side of a triangle given two sides?

A triangle is determined by 3 of the 6 free values, with at least one side. Fill in 3 of the 6 fields, with at least one side, and press the 'Calculate' button. (Note: if more than 3 fields are filled

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Solve mathematic problems

To solve a math equation, you need to find the value of the variable that makes the equation true.

Triangle Calculator

To calculate the area of a triangle using the three side lengths is surprisingly tricky. If we know the height, then the area is found by simply multiplying the height by the base length
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Triangles in Geometry (Definition, Shape, Types, Properties

Given the length of two sides and the angle between them, the following formula can be used to determine the area of the triangle. Note that the variables used are in reference to the triangle shown in the calculator above. Given a = 9, b = 7

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Properties of Triangle

Let's show how to find the sides of a right triangle with this tool: Assume we want to find the missing side given area and one side. Select the proper option from a drop-down list. It's the third one. Type in the given values.

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