The diagonal of a rectangle is sqrt(41) cm. and its area is 20 sq. cm. The perimeter of the rectangle must be:
l2+b2 = diagonal2=40
Also, lb=20
l+b2=l2+b2+2lb = 41 + 40 =81
(l + b) = 9.
Perimeter = 2(l + b) = 18 cm.
Find the surface area (in cm2) of a sphere of diameter 28 cm.
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