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In parallelogram ABCD, AB=51CM ,BC=37CM AND BD=20 CM THEN FIND THE ARE OF PARALLELOGRAM ABCD

Shaikh izrail , 7 Years ago
Grade 9
anser 2 Answers
suvidhi mehta

Last Activity: 7 Years ago

we have the three sides of triangle ADB  we can find its area by herons formula and double it to get the answer since the two triangle about the diagonal are congruent and have same area 
  s=(a+b+c)/2
and area of triangle = s(s-a)(s-b)(s-c)1/2
suvidhi mehta

Last Activity: 7 Years ago

in above answer under root is over whole expression
a,b,c are sides of triangle and s is called the semi perimeter
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