Circle circumference = 18

I know the of a circle is
I want to calculate
Area
Circumference
Radius
Diameter
All

A circle has circumference = 18. Calculate Area, Circumference, Radius, Diameter

A circle has an area of 18. Calculate the radius, diameter, and circumference.

Calculate radius (r):
A = πr2

Rearranging the equation, we get:
r2 =A
π

r =A
π

r =18
3.8

r =4.3
5

r = 2.6

Calculate diameter (d):
d = 2r
d = 2 * 2.6
d = 4.2

Calculate circumference (C):
C = 2πr
C = 2π * 2.6
C = 4.7873π or 15.0398


Click our circle equation calculator to see the equation of a circle with radius = 2.6 with center at (0,0)