Bonjour 1) Tracer un triangle RST tel que RS=6 cm,RT =7,2 cm et ST =6,9 cm.
Sur le segment [RS],placer le point U tel que RU=5 cm.
La parallèle à (ST) passant par U coupe [RT] en X.

2) Calculer RX et UX.

Merci.
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