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Find the area of the quadrilateral A B C...

Find the area of the quadrilateral `A B C D` , in which `A B=7c m ,B C=6c m ,C D=12 c m ,D A=15 c ma n dA C=9c m`

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By applying heron's formula in triangle ABC having the sides 7 cm,6 cm and 9 cm, we have
`s=(7+6+9)/2=11 cm`
Area of triangle `=sqrt[s(s−a)(s−b)(s−c)]`
`=sqrt[11(11−7)(11−6)(11−9)]`
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