There are 2 formulas to find the circumference of a circle. There is one formula to find the Area.
These are the formulas:
1.) C=πd (Circumference is equal to Pi times the diameter.)
2.) C=2πr (Circumference is equal to 2 times Pi times the radius.)
1.) (Area is equal to pi times the radius squared)
E.g. Find the Circumference and the Area of a circle that has a radius of 5.
I hope you learned something.