Answer :
The radius or diameter of the circle.
2r=D
The area is then A=r^2*[tex] \pi [/tex]
and the circumference C=2r*[tex] \pi [/tex]=D*[tex] \pi [/tex]
2r=D
The area is then A=r^2*[tex] \pi [/tex]
and the circumference C=2r*[tex] \pi [/tex]=D*[tex] \pi [/tex]