$2-10.$ Given the following data for a metric curve: $I=70{30}^{\text{'}}$;$D_m($arc defi$)=4{00}^{\text{'}}$; sta. P$.$I. $=31+06\mathrm{.}285.$ Prepare notes for setting stakes at every $10-m$ station with deflections to the nearest ${10}^{\text{'}\text{'}}.$ Partial answers: Sta. T$.$C$.=21+05\mathrm{.}054$; C$.$T$.=39+01\mathrm{.}304$; Deflection T$.$C$.$ to $22+00=0\mathrm{.}59\mathrm{.}35$ :

$2-11.$ Compute the tangent offset $t_2($Fig$.2-10)$ to sta. $62$ for the curve in problem $2-3($e$).$ Use four different methods: $(1)$ Equation $2-29$ for C$.$O$.,$ then $t_{2^{\text{'}}}=\frac{1}{2}($C$.$O$.)(0\mathrm{.}6657{)}^2$; $(2)$ Equation $2-30$; $(3)$ Equation $2-33$; and $(4)t_2=c_{2}sin3{59}^{\text{'}}{40}^{\text{'}\text{'}}.$ Answer $t_2=4\mathrm{.}65($or $4\mathrm{.}64).$

$2-12.$ Compute the tangent offset $t_2,$ to sta. $61$ for the curve in problem $2-3($e$).$ Verify answer by at least two different methods. Answer: $t_1=1\mathrm{.}17$