Here are two strong hints.
ABC is a triangle. D is the mid-point of BC, E is the mid-point of AC, F is the mid-point of AB and G is the mid-point of EF. Express the displacement vectors AD and AG in terms of OA, OB, and OC.
I am totally lost with this one. I have tried several drawings but I guess all of them were wrong. Please help!
Thanks.. But I cannot understand how did that happen. I have been studying vectors for several hours but I don't get it.
I guess that was from the parallelogram law of vectors? I do understand how can AB be OB - OA but I do not understand how's the AD derived.
Do you have a link that explains the same concept?