Médianes d'un triangle
Author: Patrice Debart

A = (2.5, 2)
B = (8, 3)
C = (6, -1)
tABC, sAB, sBC, sAC = Polygon(A, B, C)
G = Centroid(tABC)
C' = Midpoint(sAB)
A' = Midpoint(sBC)
B' = Midpoint(sAC)
AA' = Segment(A, A')
BB' = Segment(B, B')
CC' = Segment(C, C')
t3, AB, a_1, b_1 = Polygon(A, B, G)
t2, AC, a_2, c_1 = Polygon(A, C, G)
t1, BC, b_2, c_2 = Polygon(B, C, G)