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The Brainliest Answer!
2014-07-23T20:46:55+05:30
Let a parallelogram ABCD
AB=12; BC=10, and diagonal AC=8
area of parallelogram=2(area of triangle ABC)
we can find the area of triangle by using herons formula 
s=(AB+BC+AC)/2=(12+10+8)/2=15
area=under root{15(15-12)(15-10)(15-8)}
       =15√7 cm^2
area of parallelogram=30√7 cm^2
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