Question

I didn't really pay attention to my teacher when we were doing this lesson and now i'm lost >.< I need help on finding lengths given the centroid ...I tried looking back in the book for notes but they made it sound confusing using some 2/3 thing is there an easier way? If so can you please explain using the problem below .-.
http://prntscr.com/908u34

Answer 1

Yes

Answer 2

I do believe these are the mediants of the triangle, you know, that evident line that connects a vertex with the opposite side, and intersects it on it's mid-point.
@Hero You can do the rest.

Answer 3

No its fine.
I'll go find help elsewhere.