Area of parallelogram =2 × area of triangle Semi perimeter (S) =
45+35+72
2
76m Area of triangle = √s(s−a)(s−b)(s−c) (By Heron’s formula) =√76(76−72)(76−45)(76−35)=√2×2×19×2×2×31×1×41×1 =2×2×√19×31×41 =4×155.39=621.56m2 Therefore area of parallelogram=2×621.56=1243.12m2