๐Triangle Calculator
Enter the three sides of a triangle to find its area, perimeter, interior angles and type.
Enter the three side lengths of the triangle.
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Area
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Perimeter
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Type
About the Triangle Calculator
From the three sides, this calculator uses Heron's formula for the area and the law of cosines for the interior angles. It also reports the perimeter and classifies the triangle as equilateral, isosceles or scalene (and whether it is a right triangle). The sides must satisfy the triangle inequality.
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