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It depends on the information you have.
You could put the sphere on a flat surface and lower a horizontal plane onto it so that it just touches the top of the sphere. The distance between the flat surface and the horizontal plane is the sphere's diameter; the radius is half that.
Or you could measure its volume by measuring the amount of fluid (water) that it displaces in a measuring container or the overflow from any full container. Then use the formula V = 4/3*pi*R3 to work out the radius.
If you knew the density of the material of the sphere, you could measure its mass and work out its volume that way.
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How do you find the radius of a sphere given the height?
The radius of a sphere is 1/2 of its height.
How to get the formula to find radius in spherometer?
Treat the 3D sphere as a 2D circle. The radius for the sphere is the same radius as for the circle. No matter where on the sphere you place a mark, the distance (radius) from the mark to the centre of the sphere will always be the same as the circle.
Suppose the sphere below with radius r has a surface area equal to 50 units2 Find the surface area of the sphere with twice the radius?
The surface area of the sphere with the radius doubled is 200 units2.---> Confirmed
How can you find the normal to a point on a sphere at any arbitrary point on the sphere?
It's the extension of the sphere's radius drawn to that point.
Suppose the sphere below with radius r has a volume equal to 45 units3 Find the volume of the sphere with twice the radius?
360 units cubed
