l Circle diameter = 9
of a circle is
I want to calculate
Area
Circumference
Radius
Diameter
All
  

Circle diameter = 9

Answer
r = 4.5
C = 9π or 28.2743
A = 20.25π or 63.6173

↓Steps Explained:↓



A circle has diameter = 9

Calculate Area, Circumference, Radius, Diameter

Calculate radius (r):

d = 2r

Rearranging the equation, we get:

r  =  d
  2

r  =  9
  2

r = 4.5

Calculate circumference (C):

C = 2πr

C = 2π * 4.5

C = 9π or 28.2743

Calculate Area (A):

A = πr2

A = π * 4.52

A = 20.25π or 63.6173

Final Answers

r = 4.5
C = 9π or 28.2743
A = 20.25π or 63.6173


Related Calculators:  Unit Circle  |  Circle Equation  |  Annulus