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Question

The following geometrical shapes are made up of paper. ___ required the least amount of paper and ___ has the maximum volume.


A

Cube, Cylinder

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B

Cylinder, Cube

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C
Cuboid, Cube
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D
Cuboid, Cylinder
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Solution

The correct option is A

Cube, Cylinder


Calculating Surface Area of each figure:-

Surface Area of Cube = 6a2= 6 × 4 × 4 = 96 cm2

Surface Area of Cuboid = 2(lb + bh + hl) = 2(10 × 5 + 5 × 2 + 2 × 10) = 2 × 80 =160 cm2

Surface Area of Cylinder = 2πrh = 2 × 227 × 5 × 14 = 440 cm2.

Hence on comparison cube would require the least amount of paper since it has the minimum surface area.

Calculating Volume of each figure :-

Volume of Cube = a3 = 64 cm3

Volume of Cuboid = l × b × h = 10 × 5 × 2 =100 cm3

Volume of Cylinder = πr2h = 227 × 25 × 14 = 1100 cm3

Hence on comparison cylinder would have maximum volume.


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