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About Pi (π)
Pi (π) is a mathematical constant representing the ratio of a circle's circumference to its diameter. It is an irrational number, meaning it cannot be expressed as a simple fraction and its decimal representation never ends or repeats.
Key Properties:
- π ≈ 3.141592653589793...
- Irrational number (cannot be expressed as a fraction)
- Transcendental number (not a root of any non-zero polynomial)
- Used in many mathematical formulas
Common Formulas:
| Calculation | Formula |
|---|---|
| Circle Circumference | C = 2πr |
| Circle Area | A = πr² |
| Sphere Volume | V = (4/3)πr³ |
| Sphere Surface Area | A = 4πr² |
Applications:
- Geometry and trigonometry
- Physics and engineering
- Signal processing
- Probability and statistics
- Navigation and astronomy
Interesting Facts:
- Pi Day is celebrated on March 14 (3/14)
- Computers have calculated π to trillions of digits
- Ancient civilizations used various approximations
- Pi appears in many unexpected places in mathematics
- Memorizing pi digits is a popular challenge
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