l=2b 2b+2b+b=210 b=210/5=42 l=42*2=84
P=b+2l
b=l/2
P=l/2+2l=l/2+l+l=5*l/2
210=5*l/2
l=210*2/5=84cm
b=l/2=84/2= 42cm
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