a rectangular field has a perimeter of 480 and its breadth is 80 metre find its area
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Answer:
Perimeter = 2 ( l + b )
480 = 2 ( l + 80 )
l + 80 = 480 /2
l + 80 = 240
l = 240 - 80
l = 160
...
Area = l × b
= 160 × 80
= 12800
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