What is Heron's formula?​

In geometry, Heron's formula (sometimes called Hero's formula), named after Hero of Alexandria, gives the area of a triangle when the length of all three sides are known. Unlike other triangle area formulae, there is no need to calculate angles or other distances in the triangle first.

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Step-by-step explanation: you will need

240^2 / 2(70*40 + 70*50 + 40*50) = 3.46 sheets