# A heron type formula for the reciprocal area of a triangle

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Heron (or Hero) of Alexandria found what is known as Heron's formula for the area of a triangle in terms of its sides, and a proof can be found in his book, Metrica, written around 60 CE. Perimeter and Area of Triangle Calculator This triangle calculator calculates the area of a triangle and its perimeter no matter of its type by taking account of the sides and/or angles you know. There is in more information about the formulas applied below the form.