if the radius of the circle is increased by 10% then its area is increased by what % ?

• Area of circle = 3.14(r^2)
  Let, the old radius be r.
  The new radius will be 1.1r (an increase by 10%)
  Hence, new area will be 3.14((1.1r)^2) = 3.14 (1.21)(r^2)
  %increase = ((new value - old value)/(old value))*100 = 21%
  
  Answer: 21%
• 13 years agoHelpfull: Yes(11) No(2)