In order to understand this topic, I would recommend that you use these formulas to find through unknown parties unknown...
I was advised to do this on the answers of math and having solved several problems, I completely understood this topic. In my time it helped me a lot, formulas and descriptions for them you will find below.
The lengths of the medians can be obtained from Apollonius' theorem as:
where a, b and c are the sides of the triangle with respective medians ma, mb, and mc from their midpoints.