Bonjour,
Calcul de AT: th de Thalès, on a:
AT/AM= AR/AL
AT/3.2= 4.2/2.4
2.4 AT= 3.2x4.2
AT= 13.44/2.4
AT= 5.6 cm.
Calcul de ML:
ML/RT= AM/AT
ML/7= 3.2/5.6
5.6 ML= 7x3.2
ML= 22.4/5.6
ML= 4 cm.