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Question

The volume of a cuboid is twice the volume of a cube If the dimensions of the cuboid are 9 cm 8 cm and 6 cm the total surface area of the cube is :

A
72cm2
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B
216cm2
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C
432cm2
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D
108cm2
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Solution

The correct option is C 216cm2
Here length of cuboid =9cm, breadth of cuboid =8cm and height of cuboid =6cm
volume of cuboid = length × breadth × height
=9cm×8cm×6cm=432cm3 .
According to question:
volume of cuboid = 2× volume of cube
432cm3=2×(side)3
216cm3=(side)3
(6cm)3=(side)3
Side of cube = 6 cm.
Since, total surface area of the cube = 6×side2
=6×(6cm)2=216cm2

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