Can someone answer this fast!!!

Answer:
=[tex]6\sqrt{3}[/tex]
Step-by-step explanation:
This triangle is the same as a right triangle rotated around.
Pythagorean Theorem applies to this (because it's a right triangle)
[tex]a^{2} +b^{2} =c^{2}[/tex]
[tex]36+b^{2} =144[/tex]
[tex]144-36=108\\b^{2} = 108\\\sqrt{108} = 10.39\\ = \sqrt{b^{2} } \\b=10.39[/tex]
x=10.39