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Find the area of the pentagon whose vert...

Find the area of the pentagon whose vertices are A(1, 1), B(7,21), C(7,-3) D(12, 2) and E(0, -3).

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The required area
`1/2||(1,1), (7,21), (7,-3), (12,2), (0,-3), (1,1):||`
`1/2[{(21 - 21 + 14 - 36 + 0) - (7 + 147 - 36 + 0)}] = 137/2 sq. units`.
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