Question

what happens to the area of a circle when the radius is tripled

Answer 1

the area is multiplied by 9 (I'm pretty sure)

Answer 2

  A = pi*r^2 
ATriple = pi*(3r)^2 = 9*pi*r^2 = 9 A 

Triple the radius, increase the area by a factor of 9.

i hope this has helped!