Good afternoon!!
[tex]2\cdot\left(9'-4'\right)\cdot\tan\left(47,5^{\circ}\right)=2\cdot 5'\cdot\tan\left(47,5^{\circ}\right)=10'\cdot\tan\left(47,5^{\circ}\right)\approx 10'\cdot 1,091308501069271\approx 10,913085010692714'[/tex]
If you are getting 0,39 to tan, your calculator is set to radian angle, instead of degrees.
Hope to Have Helped (3H)