Question: The following control station coordinates, observed angles, and standard deviations apply to the Quadrilateral figure. Angle observations Do a weighted least squares adjustment using standard

The following control station coordinates, observed angles, and standard deviations apply to
the Quadrilateral figure.
Angle observations
Do a weighted least squares adjustment using standard deviations to calculate weights.
What are:
(a) Most probable coordinates for stations C and D and their standard deviations?
(b) The reference standard deviation of unit weight?
(c) The adjusted angles, their residuals, and their standard deviations?
The following control station coordinates,

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