Calculatrice de cercle
Vous connaissez une mesure du cercle ? Saisissez-la pour obtenir le rayon, le diamètre, le périmètre et l’aire.
Résultat
Saisissez les valeurs et appuyez sur Calculer pour voir le résultat.
Formule
Circumference is the distance around the circle.
Area is the space inside the circle.
Comment utiliser cette calculatrice
- Choose which measurement you know and enter it.
- Press Calculate. Exact answers are given in terms of π, with decimals underneath.
Exemple corrigé
A circle with radius 5
Diameter = 2 × 5 = 10.
Circumference = 2π × 5 = 10π ≈ 31.415927. Area = π × 5² = 25π ≈ 78.539816.
Questions fréquentes
Why is the answer written with π?
π is irrational, so “25π” is the exact answer. The decimal below it is rounded.
What units should I use?
Any unit works. Lengths come out in the same unit; area comes out in that unit squared.