Triangle Formulas
Heron's formula: A = √(s(s−a)(s−b)(s−c)) where s = (a+b+c)/2
Law of Cosines: c² = a² + b² − 2ab·cos(C)
Triangle Calculator
Enter 3 known values to solve the triangle.
Enter 3 sides (SSS)
Area
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Perimeter
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Type
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Angles
Angle A
0°
Angle B
0°
Angle C
0°
Height (to side c)
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Inradius
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