There are two points, A

and B

$,$ whose elevations above datum are hA$=1910$ft

and hB$=1425$ft

and whose images a

and b

on a vertical photograph have photo coordinates xa$=2\mathrm{.}95$in$.$

$,$ ya$=2\mathrm{.}32$in$.$

$,$ xb$=1\mathrm{.}64$in$.$

$,$ and yb$=2\mathrm{.}66$in$.$

The camera focal length was $152\mathrm{.}4$mm

and the flying height above datum $7850$ft

$.$

On the same photograph, an image c

of a third point C

appears. Its elevation hC$=1455$ft

and its photo coordinates are xc$=3\mathrm{.}20$in$.$

and yc$=2\mathrm{.}66$in$.$

Compute the horizontal angles in triangle ABC

$.$

Part A

Compute angle A

$.$

Express your answer in degrees to six significant figures.

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A

$=$

$$

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Part B

Compute angle B

$.$

Express your answer in degrees to six significant figures.

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B

$=$

$$

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Part C

Compute angle C

$.$

Express your answer in degrees to six significant figures.

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C

$=$

$$

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