To find the volume of a Sphere you need the following "rule" or formula: 4/3 x Pi x R³.
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The volume for a sphere is: 4πr3 3 the π is pie (3.14)
Some of the many applications that pi is used in geometry are as follows:- Finding the area of a circle Finding the circumference of a circle Finding the volume of a sphere Finding the surface area of a sphere Finding the surface area and volume of a cylinder Finding the volume of a cone
The volume of a sphere is (4/3) * pi * r^3
sphere surface area = 4 * pi * (radius2) and: sphere volume = 4/3 * pi * (radius3) ( pi = 3.141592654 approx)
There is no general rule. There are different formulae for simple figures like a sphere, a cone and a cylinder. Other figures have yet other and more complex formulae.