Hello Ken. I'm getting a weird figure trying to work this out myself. I'm using the formula for the area of a circle and get 25pi for the 10" and 16pi for the 8". Now when I plug this in to see what the percentage increase is, I get a 1.5625 which translates to a 56.25% increase in surface area from 8" to 10". That sounds like too much to me
But you just can't dispute the maths...unless
I did the maths wrong
