Circumference circles

• Circle Circumference Formula


  Circumference = π × Diameter; Circumference = π × 2 × Radius
• Pi Approximation


  Pi ≈ 3.14159; Practical approximation: 3.14
• Pi Significance


  Pi appears in calculations for circles, geometry, trigonometry, engineering, and programming
• Area of a Circle Formula


  A = πr²
• Circle Radius Formula


  Radius (r) = Circumference (C) / (2 × π)
• Diameter Formula


  d = 2r
• Circumference Formula


  C = πd = 2πr
• Circumference and Radius Relationship

  C = 2 × πr
• Approximation of Pi


  π ≈ 3.14159
• Perimeter vs Circumference


  Perimeter (P) = distance around a shape with straight sides; Circumference (C) = distance around a circle
• Circumference of a Circle

  C = 2πr
• Circumference Formula


  C = 2πr
• Pythagorean Theorem


  c = √(a² + b²)