A benchmark (RL=20.345m) was observed as a backsight with a staff reading of 1.413m. Calculate the height of plane collimation (HPC) and the reduced level of a foresight point with an inverted staff reading of 1.684m? O A. 20.345m; 22.029m B. 20.345m; 18.661m O C. 21.758m; 23.442m D. 21.758m; 20.110m

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Chapter2: Loads On Structures
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A benchmark (RL=20:345m) was observed as a backsight with a staff reading of 1.413m.
Calculate the height of plane collimation (HPC) and the reduced level of a foresight point with an inverted staff
reading of 1.684m?
O A. 20.345m; 22.029m
B. 20.345m; 18.661m
O C.. 21.758m; 23.442m
D. 21.758m; 20.110m
Transcribed Image Text:A benchmark (RL=20:345m) was observed as a backsight with a staff reading of 1.413m. Calculate the height of plane collimation (HPC) and the reduced level of a foresight point with an inverted staff reading of 1.684m? O A. 20.345m; 22.029m B. 20.345m; 18.661m O C.. 21.758m; 23.442m D. 21.758m; 20.110m
Station
S3
S2
S4
UTM
Face Left
O A. 23° 57' 20"
B. 23° 57' 15"
O C. 23° 57' 10"
O D. 23° 57′ 00″
91° 50°
TABLE 1
115° 47' 30"
UTM
Face Right
271° 50' 30"
295° 47' 50"
Mean Angle
TABLE 1 shows the horizontal angle observation records at S3, with S2 and S4 known as back station and
forward station. Determine the mean left hand angle at S3.
Transcribed Image Text:Station S3 S2 S4 UTM Face Left O A. 23° 57' 20" B. 23° 57' 15" O C. 23° 57' 10" O D. 23° 57′ 00″ 91° 50° TABLE 1 115° 47' 30" UTM Face Right 271° 50' 30" 295° 47' 50" Mean Angle TABLE 1 shows the horizontal angle observation records at S3, with S2 and S4 known as back station and forward station. Determine the mean left hand angle at S3.
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