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la méthode de la parallaxe
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Exercice 14 p.36. la méthode de la parallaxe. On désire connaître la distance D entre le poteau P et le mur QR. On place une feuille sur la ligne QR et on appelle A le point placé en Q. On cherche le point B appartenant à la droite PQ.
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la méthode de la parallaxe
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Exercice 14 p.36 la méthode de la parallaxe
On désire connaître la distance D entre le poteau P et le mur QR
On place une feuille sur la ligne QR et on appelle A le point placé en Q
On déplace la feuille sur la droite QR et on place le point A en R
Les triangles PQR et ABC ont alors leurs côtés parallèles 2 à 2
On peut donc appliquer le théorème de Thalès aux triangles PQR et ABC
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