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

Answer
Success!
r = 2.8647889756541
d = 5.7295779513082
A = 8.207π or 25.7831

↓Steps Explained:↓

A circle has circumference = 18

Calculate Area, Circumference, Radius, Diameter

Calculate radius (r):

C = 2πr

Rearranging the equation, we get:

r  =  C
  2π

r  =  18
  2 * 3.1415926535898

r  =  18
  6.2831853071796

r = 2.8647889756541

Calculate diameter (d):

d = 2r

d = 2 * 2.8647889756541

d = 5.7295779513082

Calculate Area (A):

A = πr2

A = π * 2.86478897565412

A = 8.207π or 25.7831

Final Answers

r = 2.8647889756541
d = 5.7295779513082
A = 8.207π or 25.7831
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Related Calculators:  Unit Circle  |  Circle Equation  |  Annulus