Triangle X Y Z has centroid S. Lines are drawn from each point through the centroid to the midpoint of the opposite side to form
line segments X W, Y V, and Z T. The length of line segment T S is 3 m minus 1, the length of line segment S Z is 4 m + 8, and the length of line segment X S is 2 m + 12. S is the centroid of triangle XYZ.
