Kostenloser Kreisflächenrechner
Berechne die Fläche eines Kreises anhand des Radius. Verwende die Formel A = π × r².
Fläche
78.5398
Umfang31.4159
Durchmesser10.0000
Formel
How to Calculate the Area of a Circle
Formula
A = π × r²
Where:
The area is the space enclosed within the circle.
Lösungsbeispiel
Find the area of a circle with radius 5.
- 01A = π × 5²
- 02= π × 25
- 03= 3.14159 × 25
- 04≈ 78.5398
Häufig Gestellte Fragen
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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