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Find the volume of the cylinder if height (h) and radius of the base (r) are as given below. 

i. r = 10.5 cm, h = 8 cm 

ii. r = 2.5 m, h = 7 m 

iii. r = 4.2 cm, h = 5 cm 

iv. r = 5.6 cm, h = 5 cm

1 Answer

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Best answer

i. Given: r = 10.5 cm and h = 8 cm 

To find: Volume of the cylinder 

Volume of the cylinder = πr2h

= (22/7) x 10.5 x 10.5 x 8 

= 22 x 1.5 x 10.5 x 8 

= 2772 cc 

∴ The volume of the cylinder is 2772 cc.

ii. Given: r = 2.5 m and h = 7 m 

To find: Volume of the cylinder 

Volume of the cylinder = πr2

= (22/7) x 2.5 x 2.5 x 7 

= 22 x 2.5 x 2.5 

= 137.5 cu.m

∴ The volume of the cylinder is 137.5 cu.m.

iii. Given: r = 4.2 cm and h = 5 cm 

To find: Volume of the cylinder 

Volume of the cylinder = πr2

= (22/7) x 4.2 x 4.2 x 5 = 22 x 0.6 x 4.2 x 5 

= 277.2 cc 

∴ The volume of the cylinder is 277.2 cc.

iv. Given: r = 5.6 cm and h = 5 cm 

To find: Volume of the cylinder 

Volume of the cylinder = πr2h

= (22/7) x 5.6 x 5.6 X 5 7 

= 22 x 0.8 x 5.6 x 5 

= 492.8 cc 

∴ The volume of the cylinder is 492.8 cc.

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