SOLUTION: If the Perimeter of a rectangle is 40 and the diagonal is 12 find the area.

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Question 209995: If the Perimeter of a rectangle is 40 and the diagonal is 12 find the area.
Answer by Tanzem(4) About Me  (Show Source):
You can put this solution on YOUR website!
2(l+b)=40
l+b=20 (squaring both the sides)
l2+b2+lb=400....1
Now diagonal= 12
its right angle triangle.
l2+b2= 144......2
substituting 2 in 1 we get
144+lb=400
lb=256 that is area