Question

The diameter of a right circular cylinder is 21 cm and its height is 8 cm. The Volume

of the cylinder is

(a) 528 cu cm

(b) 1056 cu cm

(c) 1386 cu cm

(d) 2772 cu cm​

Answer 1

Answer:

d

Step-by-step explanation:

radius of cylinder 21/2cm

height of cylinder=8 cm

volume of cylinder= π*r*r*h

= 22/7*21/2*21/2*8

= 77616/28

= 2772 cu cm

Answer 2

Question

The diameter of a right circular cylinder is 21 cm and its height is 8 cm. The Volumeof the cylinder is

(a) 528 cu cm

(b) 1056 cu cm

(c) 1386 cu cm

(d) 2772cu cm

Answer

Given:

Diameter of a circular cylinder=21

Height of a circular cylinder = 8

To find: Volume of a cylinder

For the circular cylinder

Diameter=21

Radius= 10.5

Height = 8

We have,

Volume of a cylinder = π r² h

Volume of a cylinder = $\frac{22}{7}$(10.5)²8

Volume of a cylinder =$\frac{22}{7}$×110.25×8

Volume of a cylinder =$\frac{22}{7}$×882

Volume of a cylinder = $\frac{22}{\cancel7}×\cancel882$

Volume of a cylinder = 126 × 22

Volume of a cylinder = 2772cm³

Hence the volume of the cylinder is 2772 cm³

The correct answer is option (d)2772cu cm