If by circle you mean sphere, then the volume of a sphere is:
4/3 * pi * radius^3.
If you already know the volume, then here's what you do:
1. Multiply the volume by 3/4.
2. Divide the volume by pi.
3. Take the cube root of both sides
In other words, the formula for radius when volume is known is:
( ( Volume * 3 ) / ( 4 * pi ) ) ^ (1/3)
The formula for area of a circle is radius squared times pi. The formula for volume of a cylinder is radius squared times pi times height.
There is none because a circle has no volume but the area of a circle is pi*radius^2
Volume = 4/3 * pi * radius * radius * radius Surface Area = 4 * pi * radius * radius
A semi-circle is a 2-dimensional figure and so cannot have a volume.
It depends on what information you have: its radius and slant height, radius and volume, radius and surface area, surface area and volume, etc.
Area of a circle = (pi)r2 [Areacircle = pi time the radius squared.] Volume of a cylinder = (pi)r2h [Volumecylinder = pi times the radius squared times the height.] (This applies to a right circular cylinder. :)
The formula for area of a circle is radius squared times pi. The formula for volume of a cylinder is radius squared times pi times height.
There is none because a circle has no volume but the area of a circle is pi*radius^2
Volume = 4/3 * pi * radius * radius * radius Surface Area = 4 * pi * radius * radius
A semi-circle is a 2-dimensional figure and so cannot have a volume.
It depends on what information you have: its radius and slant height, radius and volume, radius and surface area, surface area and volume, etc.
V = (pi * radius * radius * height)/2 ie. formula for the volume of a cylinder divided by 2
The volume is Base x height; the Base area is the same as the formula for a circle - which is proportional to the square of the radius. For example, if you double the radius (or the diameter, or the circumference) of a circle, its area will quadruple.
divide the volume by 2*pi*r where r is the radius of the base
Volume of a sphere = (4/3) x (pi) x (Radius)3
The answer depends on what information you are given: volume and radius or diameter, or surface area and radius, etc.
The formula for working out a cylinder is... pie radius squared times height The pie radius squared works out the area of one of the circle faces, and then multiplying it by the height sort of stretches out the circle face to the cylinder's exact volume