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Astracaps
@Astracaps
May 2019
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Bonjour, comment calculer la mesure des angles O,B,A, et K ?
merci de votre aide
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trudelmichel
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Il y a un octogone tracé .
Il y a 8 angles O égaux d'où 360/8=45 l'angle 0=45°
L'angle OBA angle inscrit intercepte FA
L'angle au centre FOA intercepte FA
FOA=3 anglesO =45x3=135°
angle OBA =1/2 AOF = 67.5°
triangle OBA OA=OB triangle isocèle
angle OAB=OBA=67.5°
Quant à K =90° par étude du dessin
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Verified answer
Il y a un octogone tracé .Il y a 8 angles O égaux d'où 360/8=45 l'angle 0=45°
L'angle OBA angle inscrit intercepte FA
L'angle au centre FOA intercepte FA
FOA=3 anglesO =45x3=135°
angle OBA =1/2 AOF = 67.5°
triangle OBA OA=OB triangle isocèle
angle OAB=OBA=67.5°
Quant à K =90° par étude du dessin