8. Find the lateral surface area, total surface area and volume of cube whose side is 8 cm.
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1
Side = 8 cm
C.S.A = 4 x 8 x 8 = 256 cm^2
T.S.A = 6 x 8 x 8 =384 cm^2
volume = 8 x 8 x 8 = 512 cm^3
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Class 9
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>>Surface Areas and Volumes
>>Surface Area of Cubes and Cuboids
>>If the perimeter of base of a cube is 14
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If the perimeter of base of a cube is 14 cm and its height is 3.5 cm, then its lateral surface area is
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Correct option is C)
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Perimeter of base = 14 cm ...(1)
Perimeter of square = 4a
Perimeter of cube = 4a....(2)
equation (1) & (2)
4a=14cm
a=
4
14
=
2
7
cm
height =3.5cm=
2
7
Lateral surface Area =4a
2
cm
2
=4(
2
7
)
2
cm
2
=4×
2
49
cm
2
=49cm
2
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