Sails

We known heights 220, 165 and 132 of sail. It has triangular shape. What is the surface of the sail?

Correct result:

T =  18150

Solution:

h=1/220+1/165+1/1322=0.0091 T=14⋅h(h−1/220)(h−1/165)(h−1/132)=18150h = \dfrac{ 1/220 + 1/165 + 1/132}{2} = 0.0091 \ \\ T = \dfrac{1}{4\cdot \sqrt{ h(h - 1/220)(h - 1/165)(h - 1/132)}} = 18150

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