Circle Calculator
About Circle Calculator
The Circle Calculator is used to calculate the area, circumference, diameter or radius of a circle. Given any one variable of a circle, you can calculate the other 3 unknowns.
Formulas
The following is the calculation formulas of the area, circumference and diameter of a circle whose radius is r:
The diameter of a circle
d = 2r
The circumference of a circle
C = 2πr = πd
The area of a circle
A = πr2
Where:
A = area of circle
C = circumference of circle
d = diameter of circle
r = radius of circle
π = 3.141592654
