How do I find the area of a circle when the radius is defined as (x+1)?

Question

The problem also requests that pi be left as pi, not using 3.14 OR 22/7 as possible numerical forms. I also need to determine the circumference. Any help would be appreciated.

Answer 1

r=(x+1)

area=pi*r^2

=pi*(x+1)^2

c=2*pi*r

=2*pi*(x+1)

Answer 2

Use substitution.

r = x+1

area = πr²

= π(x+1)²

circumference = 2πr

= 2π(x+1)