Question

Very confused on this. Please help!

http://i85.photobucket.com/albums/k62/sbpll2012/omg_zpsf1c9b0e3.jpg

Answer 1

ok, so similar shapes have the same ratio across each of the sides
so if u have a look at the triangles first: (Q20)

Answer 2

sorry, terrible drawing, but

these angles = eachother
so A = A, B = B and C = C... yeah?

Answer 3

I kind of get it...So this means they're similar? and then when it asks what the value is??

Answer 4

well that's what those lines mean anyway
see in your link/picture, the double arc around the angle I labelled B... means those 2 angles = each other

and the single arc around the angles I labelled A... means those 2 angles = eachother
and if they are the same in each triangle, then the middle ones MUST = each other also

Answer 5

so as they are the same, the triangles are "similar triangles" so the small one (on the left) is just a ratio of the big one (on the right)
so lets find the ratio

Answer 6

so we know the value of a similar side in each triangle