Question

Geometry :) @Yttrium
http://gyazo.com/1096d760b97e3a2ab618443e7a21564d

Answer 1

First of all, of course you need to find the ratio of proportionality. Can you find it?

Answer 2

Well the top 12 and 15 is 4:5?

Answer 3

Well hmm. 15 and 40 is .375

Answer 4

ignore the 12 and 15..

Answer 5

Actually, the theorem states likes this

so, if there is a line parallel to one side of the triangle, it proportionally divides the other two sides. Hope you get it

Answer 6

So BD=20?

Answer 7

Yes :D

Answer 8

Another question :)