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Find the area of the quadrilateral `A B C D` whose vertices are respectively `A(1,\ 1),\ B(7,\ -3),\ C(12 ,\ 2)` and `D(7,\ 21)` .

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Area of quadrilateral ABCD = Area of traingle ABC + Area of triangle ACD,
Area of triangle =`1/2​[x_1​(y_2​−y_3​)+x_2​(y_3​−y_1​)+x_3​(y_1​−y_2​)]`
Area of triangle `ABC=1/2[1(−3−2)+7(2−1)+12(1+3)]`
`=24`square units
...
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