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Question

Nexus made a hole of dimensions
2 cm × 3 cm × 6 cm through a cube of side 6 cm. Calculate the volume of the remaining cube.

A
190 cubic cm
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B
170 cubic cm
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C
180 cubic cm
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D
188 cubic cm
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Solution

The correct option is C 180 cubic cm
Remaining volume = Volume of the cube - Volume removed by making hole

Volume of the cube
= Length × Width × Height

For a cube: length = width = height

Volume of the cube
= 6 × 6 × 6 = 216 cubic cm

Volume of the cuboid
= Length × Width × Height
= 2 × 3 × 6
= 36 cubic cm

Volume remaining = 216 - 36
= 180 cubic cm

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Q. Question:

Question 8
A solid cube of side 12 cm is cut into eight cubes of equal volume. What will be the side of the new cube? Also, find the ratio between their surface areas.

Mathematics Surface Areas and Volumes Volume of Solids
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Solution:

Side(a) of the cube = 12 cm

Volume of the cube =(a)3=(12 cm)3=1728 cm3

Let the side of the smaller cube be a1.

Volume of 1 smaller cube =(17288)cm3=216 cm3(a1)3=216 cm3⇒a1=6 cm

Therefore, the side of the smaller cubes will be 6 cm.

Ratio between surface areas of cubes =Surface area of bigger cubeSurface area of Smaller cube=6×1226×62=(12)2(6)2=41

Therefore, the ratio between the surface areas of these cubes is 4:1.

my doubt is how this a1 got 6cm

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