Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant—the ratio of the circumference of a circle to its diameter—which is approximately 3.14159.

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Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant—the ratio of the circumference of a circle to its diameter—which is approximately 3.14159.



  1. Calculating the circumference of a circle:

To find the circumference of a circle, simply multiply the diameter by pi: C = πd. For example, if the diameter of a circle is 10 cm, its circumference would be C = π(10) = 31.4 cm (rounded to one decimal place).

  1. Calculating the area of a circle:

To find the area of a circle, the formula is A = πr², where r is the radius of the circle. For example, if the radius of a circle is 5 cm, its area would be A = π(5)² = 78.5 sq cm (rounded to one decimal place).

  1. Calculating the volume of a cylinder:

The formula for the volume of a cylinder requires the use of pi. The formula is V = πr²h, where r is the radius of the circular base of the cylinder and h is the height of the cylinder. For example, if the radius of the base is 4 cm and the height of the cylinder is 10 cm, its volume would be V = π(4)²(10) = 502.7 cu cm (rounded to one decimal place).

  1. Using pi in trigonometry:

Pi is also used in trigonometry to calculate angles and ratios. For example, sin π/2 = 1, cos π = -1, and tan π/4 = 1.

  1. Using pi in calculus:

Pi appears in many calculus equations, such as the arc length of a curve, the area under a curve, and the volume of a solid of revolution.

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