The equation for circumference is C=2(pi)(r) where C is the circumference and r is the radius.
You can find the radius by plugging in the circumference into this equation and solving the equation.
That depends what you know about the sphere. For example, if you know the diameter, just divide it by 2 to get the radius.
1/2 diameter or the circumference/pi/2
The radius of a sphere joins the center of the sphere to its circumference.
Finding the radius of a Sphere by using the surface area is a multi-step mathematical equation. The radius (r) of a sphere with a surface area of 1742400ft is 372.365ft.
A radius of a sphere is the distance from its centre to its surface. It is also half of the diameter. If you know the circumference of a circle, you can calculate its radius. Circumference divided by Pi divided by 2 = radius.
2*pi*radius.
A baseball is a sphere, and circumference is for 2D figures..... If you were to turn it into a 2D figure, then the equation would be: Circumference = 2 x 3.14r, or if you have the diameter, C = d x 3.14
Circumference of a sphere = 2*pi*radius or diameter*pi
C = 2(pi) r circumference of a sphere = 2*pi*radius or pi*diameter (Any circular circumference is the same for a perfect sphere.)
Finding the area of a circle: pi*radius2 Finding the circumference of a circle: 2*pi*radius or diameter*pi Finding the surface area of a sphere: 4*pi*radius2
It is the radius
pr r^2