How to find the area of a circle

Area of a circle

1. How to find the area of a circle with the radius

Know: radius

area of a circle

What is its area?

Formula for the area of a circle: A = π.R2.

  • Area of a circle: A
  • π ≈ 3,14159
  • Radius: R

2. How to find the area of a circle with the diameter

Know: Diameter

area of a circle with the diameter

What is its area?

Formula for the area of a circle: $A = \frac{1}{4}.\pi .{D^2}$

  • Area of a circle: A
  • π ≈ 3,14159
  • Diameter: D

Note: D = AB = 2R => D/2 = R => A = π.(D/2)2. = 0,25.π.D2

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