les réponses de l'élève sont 1 et 2
En utilisant le théorème de Thales
RA/RO = RS/RK = AS/OK
RA/RO = AS/OK ; RA = OR - OA = 6.84 - 3.8 = 3.04 cm ( 1)
OR - OA)/RO = AS/OK
OK = AS x RO/(OR-OA) = 5 x 6.84/6.84-3.8 = 5 x 6.84/3.04 = 11.25 cm (2)
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les réponses de l'élève sont 1 et 2
En utilisant le théorème de Thales
RA/RO = RS/RK = AS/OK
RA/RO = AS/OK ; RA = OR - OA = 6.84 - 3.8 = 3.04 cm ( 1)
OR - OA)/RO = AS/OK
OK = AS x RO/(OR-OA) = 5 x 6.84/6.84-3.8 = 5 x 6.84/3.04 = 11.25 cm (2)