Exam Notes: Formulas for a Circle

There are 2 formulas to find the circumference of a circle. There is one formula to find the Area.
These are the formulas:

Circumference:
1.) C=πd (Circumference is equal to Pi times the diameter.)
2.) C=2πr (Circumference is equal to 2 times Pi times the radius.)


Area:
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.

Circumference:
C=2πr
C=2x3.14x5
C=3.14x10
C=31.4 


Area:
A=πrr
A=3.14x5x5
A=3.14x25
A=78.5

I hope you learned something.