The area of a rectangle is 800sq.cm.Perimeter is 100cm.What is the length of its diagonal?
Area=lb=800,Perimeter=2(l+b)=100
l+b=50,(l+b)²=2500,l²+b²+2lb=2500,l²+b²+1600=2500
l²+b²=900,√l²+b²=30
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