Question

If the radius of a sphere is increased by 20 %, by what per cent does
increase ?
20%, by what per cent does its volume increase ?​

Answer 1

Answer:

Let the radius be = r

⇒The volume = 4πr³/3

When the radius is increased by 20%

 ⇒The new radius is r+20*r/100 =1.2r

⇒The new volume is = 4π(1.2r)³/3 = 1.728*(4πr³/3)

⇒The %increase in volume = (1.728(4πr³/3)-4πr³/3)*100/(4πr³/3)=72.8%

⇒The volume will increase by 72.8%

Answer 2

Answer:

hope it will help you..