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Triangle by three sides

Area, perimeter and angles using Heron's formula.

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Enter known values

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Live diagram of the known values
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Formulas

P=a+b+cP=a+b+cs=P2s=\frac P2A=s(s−a)(s−b)(s−c)A=\sqrt{s(s-a)(s-b)(s-c)}A=arccos⁡b2+c2−a22bcA=\arccos\frac{b^2+c^2-a^2}{2bc}B=arccos⁡a2+c2−b22acB=\arccos\frac{a^2+c^2-b^2}{2ac}C=arccos⁡a2+b2−c22abC=\arccos\frac{a^2+b^2-c^2}{2ab}

How it works

Area, perimeter and angles using Heron's formula.

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