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A cylindrical is within the cube …

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A cylindrical is within the cube touching all the vertical faces.A cone is inside the cylinder .If their height are the same with the Same base .Find the ratio of their volumes.

  • 1 answers

Naveen Sharma 8 years, 10 months ago

Ans. Let the length of each edge of the cube is a.
Volume of cube = a3  (1)
 

Since the Cylinder is within the Cube and it touches all the vertical faces of Cube.

Diameter of Cylinder = a 
Radius of base of the cylinder = \(a\over 2\)     
Height of Cylinder = a

Volume of Cylinder = \({ {22 \over 7} \times ({a \over 2})^2} \times a = {11 \over 14 }a^3\)      (2)

 

As Cone and Cylinder has same base

Radius of the Cone = \(x \over a\)
Height of Cone =  a

Volume of Cone = \({1 \over 3} \times { {22 \over 7} \times ({a \over 2})^2} \times a = {11 \over 42 }a^3\)    (3)

 

Ratio of volumes, From (1) (2) and (3)

=> \( a^3 :{11 \over 14 }a^3:{11 \over 42 }a^3\)

Multiply by 42 and divide by a3, We get 

=> 42 : 33 : 11

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