19
Is easy if we rotate the figure in a next way
we can calculate using the law of sines
First we found the missing angle
180-36-90=54
then we can use the law of sines
[tex]\frac{x}{\sin(90)}=\frac{13}{\sin (54)}[/tex]
then we clear x
[tex]x=\frac{13\cdot\sin (90)}{\sin (54)}=16.1[/tex]
x=16.1
