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
l+b2=l2+b2+2lb = 41 + 40 =81
(l + b) = 9.
Perimeter = 2(l + b) = 18 cm.
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If the edge of a cube is increased by 4 cm, the volume will increase by 988 . Then the original length of each edge of the cube is
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