⭕ Circle Properties Explorer

Adjust the radius slider below. See the circle dynamically resize, and watch how the Diameter, Circumference, and Area are calculated in real-time!

Radius (r)
5
Diameter (d)
10
Circumference (C)
31.42
Area (A)
78.54
5
Radius (r)
5

📝 The Math Breakdown

  • Diameter: The distance across the entire circle, passing through the center. It is always exactly twice the radius.
    Formula: d = 2 × r
    Calculation: 2 × 5 = 10
  • Circumference: The distance around the outside border of the circle (like the perimeter).
    Formula: C = π × d  or  C = 2 × π × r
    Calculation: 2 × 3.14159 × 5 ≈ 31.42
  • Area: The amount of space inside the circle.
    Formula: A = π × r²
    Calculation: 3.14159 × (5 × 5) ≈ 78.54
* Note: Calculations above use π ≈ 3.14159 and are rounded to 2 decimal places.