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EXERCICE 1:
1º) Sur du papier blanc à coller sur la copie double, construire un triangle RAT
tel que RT = 3,6 cm; RA = 4,8 cm et AT = 6 cm.
Placer le point O de la demi-droite [RA) tel que RO = 7 cm.
Tracer la droite parallèle à la droite (RT) passant par O; elle coupe la droite
(AT) en N. Placer N.
2°) Le triangle RAT est-il rectangle? justifier la réponse.
3°) Calculer, en justifiant, NO.