Problem#$8($Show Work to Get Credit$)(40$ Points$)$

The figure below shows two current segments. The lower segment carries a current of $i_1=0\mathrm{.}40$A and includes a semicircular arc with radius $5\mathrm{.}0$ cm $,$ angle $180,$ and center point $P.$ The upper segment carries current $i_2=2i_1$ and includes a circular arc with radius $4\mathrm{.}0$ cm $,$ angle $120,$ and the same center point $P.$ What are the $($a$)$ magnitude $(30$ points$)$ and $($b$)$ direction of the net magnetic field $B$ at $P$ for the indicated current directions? $(10$ points$)$ What are the $($c$)$ magnitude and $($d$)$ direction of $B$ if $i_1$ is reversed? $(10$ Points Extra Credit$)$