In Problems $12\mathrm{.}8$ to $12\mathrm{.}10$ balance by the compass rule the latitudes and departures computed for each of the traverses of Problems $12\mathrm{.}1$ to $12\mathrm{.}3.($Ans$.$: Problem $12\mathrm{.}9$ for AB $77\mathrm{.}695,461\mathrm{.}366,$ for CD

D $46\mathrm{.}420,321\mathrm{.}710)$