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Pi is an irrational number. It is approximately 3.14. It is the ratio between the circumference and the diameter of a circle. It is represented by the symbol π.
V = [ggfrac]1/3[/ggfrac]πr2h. r is the radius of the circle at the base and h is the distance between the center point of the circular base and the point at the top of the cone.
V = [ggfrac]4/3[/ggfrac]πr3. If I cut the sphere exactly in half I could see a circle on the face. r is the radius of the circle at the very center of the sphere.
The ratio of the circumference of a circle to its diameter. This is always the same number: approximately 3.14. The actual number is an irrational number (a decimal that never ends or repeats).
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