Circle area = 9

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

A circle has area = 9

Calculate Area, Circumference, Radius, Diameter

A = πr2

Rearranging the equation, we get:

 r2  = A π

 r  = √A √π

 r  = √9 √3.1415926535898

 r  = 3 1.77245

r = 1.6925687506433

Calculate circumference (C):

C = 2πr

C = 2π * 1.6925687506433

C = 3.3851π or 10.6347

Calculate diameter (d):

d = 2r

d = 2 * 1.6925687506433

d = 3.3851375012865

Final Answers

r = 1.6925687506433
C = 3.3851π or 10.6347
d = 3.3851375012865

What is the Answer?
r = 1.6925687506433
C = 3.3851π or 10.6347
d = 3.3851375012865
How does the Circles Calculator work?
Free Circles Calculator - Calculates and solves for Radius, Diameter, Circumference, and Area of a Circle.
This calculator has 1 input.

What 3 formulas are used for the Circles Calculator?

d=2r
A = 2πr2
C=2πr

For more math formulas, check out our Formula Dossier

What 7 concepts are covered in the Circles Calculator?

area
Number of square units covering the shape
circle
the set of all points in the plane that are a fixed distance from a fixed point
circles
circumference
the perimeter of a circle or ellips
diameter
distance from two endpoints of a circle through the center
d = 2r
origin
On a two digit coordinate plane, the point (0, 0), where the x-axis and y-axis cross.
radius
Distance from the center of a circle to the edge
C/2π

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