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If you are talking about "pi", the math constant related to circles, it is exactly 3.14159265358979. Most people use the approximation of 3.14 in calculating the area of a circle, the circumference, or the volume of a sphere. For very rough approximations, use 3. For example, the circumference of a circle is "pi" x diameter. So a 24-inch bike tire is about 72 inches around. The area of a circle is "pi" x radius squared. So a 10-inch Pizza gives you about 75 square inches to eat.

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