Question

What is the value of x?
See Attachment
6<--
6.5
11
5.5

Answer 1

Assuming these are all equilateral triangles, you can fill in the unknown sides by equating them to known sides and by adding or subtracting lengths.

You may end up with a pair of equations for x and y, but you can solve these, too.

Answer 2

I figured it out it was 5.5

Answer 3

Congratulations!