georgescott3601
georgescott3601 georgescott3601
  • 25-04-2016
  • French
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secretlyamacat
secretlyamacat secretlyamacat
  • 27-04-2016
Tu dois utiliser les mesures d'angles pour trouver le % de la surface recherchée.
Par exemple, si on cherche la longueur d'un arc marqué par un angle au centre de 155%, on met 155/360 pour trouver le % de la circonférence représentée par le cercle. (Disons x%)
Puis, tu calcules la circonférence totale du cercle avec la formule pi * 2r.
Finalement, tu calcules la longueur de l'arc en calculant x/100 = ?/circonférence
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