Q$3$: Referring to the four$-$bar angle definitions shown above in Q$4$A$\mathrm{.}1,$ and the chirality configurations shown in Figure $4$A$\mathrm{.}7,$ Use CAD to find $\backslash$theta $3$ when r$1=5,$ r$2=3,$ r$3=4,$ r$4=4\mathrm{.}5\backslash$theta $2=30\backslash$deg $,$ given that $\backslash$chi $($AO$2$O$4)=1,$ and $\backslash$chi $($O$4$BA$)=-1.($Pic that looks like a bow tie$)$

Q$4$: Referring to the four$-$bar angle definitions shown above in Q$4$A$\mathrm{.}1,$ and the chirality configurations shown in Figure $4$A$\mathrm{.}7,$ Use CAD to find $\backslash$theta $3$ when r$1=5,$ r$2=3,$ r$3=4,$ r$4=4\mathrm{.}5\backslash$theta $2=-30\backslash$deg $,$ given that $\backslash$chi $($AO$2$O$4)=-1,$ and $\backslash$chi $($O$4$BA$)=-1.($other pic$)$

Can someone explain what am i doing wrong and why is it not $67\mathrm{.}59?$ and please explain chirality.