To find it directly
A = 2 pi r h
A is proportional to rh
factor 2
A is multiplied by 2 * 2 = 4
factor 3
3 * 3 =9
factor 5
5 * 5 = 25
factor 10
10 * 10 = 100
(b) the increase in A by factor x is x^2
c(20)^2 = 400
Answer:

Step-by-step explanation:
The formula of the area of a triangle is
. Plugging in the given base and height values, you get
. Hope this helps!
Answer:
I don't see any ratios to compare.
Step-by-step explanation: