bonjour
BA/BD = BE/BC = AE/DC
BA/4.9 = 5/7
BA = 4.9 x 5/7 =3.5 cm
5/7 = 6/DC
DC = 42/5 = 8.4 cm
AD = CD donc ADC est isocèle en D
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bonjour
BA/BD = BE/BC = AE/DC
BA/4.9 = 5/7
BA = 4.9 x 5/7 =3.5 cm
5/7 = 6/DC
DC = 42/5 = 8.4 cm
AD = CD donc ADC est isocèle en D