Actually it isn't. That's the formula for a cylinder. A cone is 1/3 of that value.
Pi times Radius times Radius times height
The volume of a cone is one-third the base area times the height. It can also be written as the volume of a cone is one-third pi times the square of the radius of the base times the height.
A cone with a radius of 3 and a volume of 37.7 has a height of about 4 units.
A cone with a radius of 3 and height of 3 has a volume of 28.27 units3
A cone with a radius of 8 and a height of 8 has a volume of 536.17 units3
A cone with height 18 and radius 6 has a volume of 678.6 units3
the volume changes as radius squared and linear with height, so tripling radius and double of height gives 3 x 3 x 2 = 18 times more volume
Since the volume of a cone is proportional to the square of the radius (look at the formula), double the radius would mean four times the volume.
The volume of a cone is 1/3 pi times the radius squared times the height. When given the volume and height divide both sides by the height. Volume divided by height is equal to 1/3 times pi times the radius squared. Now divide both sides by 1/3 pi. This will leave you with the radius squared. Take the square root of both sides and you will get the radius.
A cone that has a radius of 20m and a height of 25m has a volume of 10471.98m3
A cone with height 8cm and radius 15cm has a volume of 1884.96cm3
A cone, when radius is 4 and height is 21, has a volume of 351.86 units3