Question

What is the value of x?

Answer 1

You can use Thales' Theorem

Answer 2

have you covered similar proportions yet?

Answer 3

It should be obvious from the "triangle" picture here: http://www.storyofmathematics.com/greek.html

Answer 4

Yep, I did a proportion and came up with an answer, but it wasn't in the choices. And Thales' Theorem wouldn't really help, would it?

Answer 5

Well it's really just the same as using the idea of similar triangles.. just with a fancy name

Answer 6

what did you get using the proportions?