A 20-foot-long footbridge has two diagonal supports that meet in the center of the bridge.

Each support makes a $\displaystyle{{65}}^{\circ}\usepackage{cmbright}\Huge\$ angle with a short vertical support.

What is the length x of a diagonal support, to the nearest tenth of a foot?

$\displaystyle{x}\approx\usepackage{cmbright}\Huge\$ _____ feet