Question

Let ABC be any triangle. Designate by A', B' and C' the respective midpoints of [BC] , [CA] and [AB]

1° Show that AA' + BB'+CC' = 7.
2° Deduce that, if G is the centroid of triangle ABC, then G is also the centroid of triangle
A'B'C'.​

Answer 1

I'm not really sure but thanks for the points