Perimeter of a Triangle With Vertices Calculator

To calculate the area and the perimeter, begin at the top of the left column and number each point, starting at 1, proceeding to the right column . Enter the number of vertices in the form, then enter each vertex's x and y values. After
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Calculating Area and Perimeter

If sides b and c are equal at 6 feet and the angle is 30° then the length of side a is √b 2 + c 2 - 2 x b x c x cosα = √36 + 36 - 2 x 6 x 6 x cos (30°) = √72 - 72 x 0.866025 = √72 - 62.3538 = √9.65 = 3.1 ft. The perimeter is then 3.1 + 6 + 6 = 15.1 feet.

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