a) EBD et ABC
b) THEOREME DE THALES s'applique car ED// AC
BE/BC = BD/DA = ED/CA
BE/7 = 0.5/3.5 BE = 7 x 0.5/3.5 = 1 cm
ED/5.6 = 0.5/3.5 ED = 5.6 x 0.5/3.5 = 0.8 cm
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a) EBD et ABC
b) THEOREME DE THALES s'applique car ED// AC
BE/BC = BD/DA = ED/CA
BE/7 = 0.5/3.5 BE = 7 x 0.5/3.5 = 1 cm
ED/5.6 = 0.5/3.5 ED = 5.6 x 0.5/3.5 = 0.8 cm