Réponse:
fig.1 BC/MN = AB/AM = AC/AN
AC/AN = AB/AM
AN= AC×AM/AB
AN= (35×6)/28
AN= 7.5
fig.2 BC/MN = AB/AM = AC/AN
AB/AM = AC/AN
AB= AM×AC/AN
AB= 3×39/2
AB= 58.5
fig.3. MN/IP = AM/AP = AN/AI
MN/IP = AM/AP
IP= MN×AP/AM
IP= 1.5×1.5/2
IP= 1.125
Explications étape par étape:
on utilise le théorème de thalès
