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FEUILLE DE PROGRAMME
Programme pour
Cercle et tangentes
Description
Formule pour le cercle:
x
2
+ y
2
= r
2
Formule pour la droite tangente
passant par le point A (
x', y'):
yy' = m (xx')
*
m représente la pente de la
droite tangente.
Avec ce programme, la pente
m et l’intersection b (= y'mx') sont obtenues pour les lignes
tracées à partir du point A (
x', y') et sont tangentes à un cercle de rayon = r. La fonction Trace
est utilisée pour obtenir les coordonnées aux points de tangence, et le facteur de zoom est
utilisé pour agrandir le graphe.
Exemple
Déterminer m et b pour les valeurs suivantes:
r = 1
x' = 3
y' = 2
Remarques
Le point marqué pour A ne peut pas être déplacé. Même si vous le changez de place sur le
graphe, le calcul est effectué pour la valeur d’origine.
Une erreur (Ma ERROR) se produit quand
r = x'.
•Veillez à toujours exécuter la lecture des coordonnées quand vous sélectionnez la fonction
Trace et que le message TRACE apparaît.
Préparatifs et fonctionnement
Stockez le programme écrit sur la page suivante.
Exécutez le programme indiqué ci-dessous.
No.
4
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