Question

A cylinder is having radius 7 cm and height 21 cm. Complete the following activity to calculate its volume and circumference of its base.

Activity: 

Radius (r) = 7 cm, Height (h) = 21 cm.

The volume of a cylinder = `square`        ...(Formula)

= `22/7 xx 7 xx 7 xx square`

= 154 × 21

= `square` cm³

The circumference of the base = `square`      ...(Formula)

= `2 xx 22/7 xx square`

= `square` cm.

Answer 1

Radius (r) = 7 cm, Height (h) = 21 cm.

The volume of a cylinder = \[\boxed{πr^2h}\]      ...(Formula)

= `22/7` × 7 × 7 × \[\boxed{21}\]

= 154 × 21

= \[\boxed{3234}\] cm³

The circumference of the base = \[\boxed{2πr}\]      ...(Formula)

= `2 xx 22/7 xx` \[\boxed{7}\]

= \[\boxed{44}\] cm.