A preiminary road design has been determined The alignment consists of $3$ tangents and shown. Given the coordinate data for the points $A,Pl,P{l}_2$ and $B_1$ determine

a$)$ the deflection angle at $P{l}_1$ and $,$

b$)$ the distance from $P{l}_1$ to $P{l}_2(3$ decimal places$)$

$\backslash$table$[[$A$,P{l}_1,Pl,$B$],[$N $800946,$N $10$ba $834,N10006234,$N $1066093],[$E $1536\mathrm{.}565,$E $1340969,$E$1186245,$E $1057885]]$

a$=1,$b$=1,$ e$=9,$ f$=3$