Data

HELD COORDINATES $[$ft$]$

A $(10\mathrm{.}24,305\mathrm{.}05)$

B $(1287\mathrm{.}85,312\mathrm{.}77)$

FIND

$1.$ Coordinates $(x,y)$ of points $C$ and $D.$

$2.$ Standard deviations of adjusted unknowns.

$3.$ Residuals and standard deviations of adjusted observations.

The final reference standard deviation and number of iterations.

Hint: You should need no more than $5$ iterations.

INITIAL APPROXIMATIONS

xYou may derive initial approximations using the method shown in the textbook or by using the following additional information. Using a compass, the crew observed an azimuth of $115$ from $A$ to $C$ and an azimuth of $65$ from $A$ to $D.$