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3. let afrafr be the area of a circle of radius...

# Question: let afrafr be the area of a circle of radius...

###### Question details

Let A=f(r)A=f(r) be the area of a circle of radius r.

(a) Write a formula for f(r)=f(r)=

(b) Which expression represents the area of a circle whose radius is increased by 20%?

A. 0.2f(r)0.2f(r)
B. f(r+0.2)f(r+0.2)
C. f(1.2r)f(1.2r)
D. f(20+r)f(20+r)
E. f(r)+0.2f(r)+0.2

(c) By what percent does the area increase if the radius is increased by 20%?
% (round to the nearest 0.01%) help (numbers)