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Q.

If the length of the body diagonal of the cube is 63cm, then find the length of the edge of the cube.

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a

21 3 cm  

b

26cm 

c

25cm

d

22cm

answer is B.

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Detailed Solution

Given, length of the body diagonal of the cube is 63cm.
Let 'a' be the edge of the cube.
The body diagonal of the cube is given by,
  d=a 3  .
Since d=a 3   it can be written as,
63=a3
633=a
a=21 3 cm  
The length of the edge of the cube is 21 3 cm  .
Therefore, the correct option is 2.
 
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