bonjour voici mon exercice.​

Hello,

if M' is symmetrical to M with respect to point O then O is middle of line segment [MM']

if M' is symmetrical to M about line (EF) then (EF) is perpendicular bisector of line segment [MM']

if M' is the image of M under vector translation AB then vector MM' equals vector AB.

You can find the three drawings below.