Circle Area Calculator
Calculate the area of a circle from its radius. Also shows the diameter, circumference, and other circle properties.
Surface
78.5398
Circonférence31.4159
Diamètre10.0000
Formule
## How to Calculate the Area of a Circle ### Formula **A = π × r²** Where: - **A** = Area - **π** ≈ 3.14159 - **r** = radius The area is the space enclosed within the circle.
Exemple Résolu
Find the area of a circle with radius 5.
- 01A = π × 5²
- 02= π × 25
- 03= 3.14159 × 25
- 04≈ 78.5398
Questions Fréquentes
How do you find the area of a circle?
Multiply π (pi, approximately 3.14159) by the square of the radius: A = πr².
How do you find the area if you know the diameter?
The radius is half the diameter. So A = π × (d/2)² = πd²/4.
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