If the radius of a circle is increased three times then its area is increased:

(A) three time
(B) six times
(C) nine times
(D) none of these

The answer is: (C) nine times
Area = πr²
If radius is increased by 3 times, then
NewArea = π(3r)² = π9r² =9(πr²) =9(Area)
So, area is increased by 9 times.