Answers

2016-02-27T20:30:15+05:30
In triangle AOD, AE is median.
 So,ar(AOD)=2*10 sq.cm(Median divides the triangle into 2 triangles of equal area.)
  Therefore, ar(ABCD)=4*2*10 sq.cm=80 sq.cm( Since diagonals of parallelogram divides it into 4 triangles of equal areas.)
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