The perimeter of a rectangle is 140 m and its area is 640m2
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pm=2(l+b)
2(l+b)=140
l+b=70
b=70-l
area =l×b
l×b=640
l×(70-l)=640
l²-70l+640=0
d=4900-4×640
d=4900-2560=2340
l=70+48.1/2=59.50=60m
b=10m
2(l+b)=140
l+b=70
b=70-l
area =l×b
l×b=640
l×(70-l)=640
l²-70l+640=0
d=4900-4×640
d=4900-2560=2340
l=70+48.1/2=59.50=60m
b=10m
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