Réponse :
1) a) RE/RS = RF/RT = EF/ST
b) OK/OG = OL/OH = KL/GH
2) 6 4.8 PR
5 OM 7.5
6 x OM = 5 x 4.8 ⇔ OM = 5 x 4.8/6 = 4 cm
4 x PR = 4.8 x 7.5 ⇔ PR = 4.8 x 7.5/4 = 9 cm
3) a) triangles OSL et OIN
b) SL/SI = SO/SN = LO/IN
c) 7/SI = 5/3 ⇔ SI = 21/5 = 4.2 cm
Explications étape par étape :
