bonjour
d'après le th de Thalès
EH / EF = EG / ED = GH / DF
EH / EF = HG / DF
EH / 14 = 12.6 /16. 8
16.8 EH = 176.4
EH = 10.5 cm
EH / EF = EG /ED
10.5 / 14 = 10.5 / ED
10.5 ED = 147
ED = 14 cm
