What is the stretch of the spring holding a wedged board?

[candyq27]

Homework Statement

A 11.5 kg board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 206 N/m and is parallel to the floor. Find the amount by which the spring is stretched from its unstrained length.

Homework Equations

F=-kx

The Attempt at a Solution

I tried doing sin50(11.5kg)/-206 but that didn't work

 

[berkeman]

Can you post the drawing?

 

[candyq27]

I tried but it didnt work. I'm not sure how to do it.