Question

So confused.

Answer 1

the sides with that little line crossing it, are all equal.

Answer 2

I got that. I don't understand how to calculate x.

Answer 3

you have some isosceles triangles. start labeling their angles.

Answer 4

lol sorry I didnt see the second image :$

Answer 5

Like this?

Answer 6

yes, but don't forget the middle triangle.
I just started writing equations, eventually I was able to get all the angles in the big triangle as a function of x only.

Answer 7

Notice in my picture y is the exterior angle of the bottom triangle, so y= x+x = 2x
that means the top angle y+x can be written as 3x
now we need to find angle a as a function of x

Answer 8

y is the exterior angle

if that doesn't mean much, you can write down the 3 angles of the bottom triangle as x+x+ (180-y) = 180
and we get the same thing: y= 2x

Answer 9

Oh okay. So then z = 180 - 4x

Answer 10

or.....?

Answer 11

That is one way. notice the straight line x+z+a =180
so you can find a as a function of x

Answer 12

Did you get what a is ?