An instrument was set up over TBM 1, and backsights onto point A before sighting onto B. The instrument was then moved to B, back-sighted onto TBM 1 and then sighted at C. It was moved once again, to C, back-sighted onto B before being sighted onto D. The line between TBM 1 to point A is to act as the reference plane for the site (taken as zero degrees: 0° 0' 0"). Note that the instrument would not provide the ability to zero the horizontal angles before taking a reading. Instrument located at TBM 1 PT B PT C Instrument Instrument sighted Face onto (FL/FR) FL FL FL FL FL FL A B TBM 1 C BO D Horizontal angle reading Degrees Minutes Seconds (9) () (") 3 0 15 20 0 30 10 319 358 106 3 176 30 50 0 40 5 52 Calculate the whole circle angle (i.e. with reference to line TBM 1-A) for the angle measured at point C. (angle BCD) and express it as a decimal to 4 decimal places (enter the angle, in degrees, as a decimal rather than expressing it in degrees. minutes and seconds:")

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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An instrument was set up over TBM 1, and backsights onto point A before sighting
onto B. The instrument was then moved to B, back-sighted onto TBM 1 and then
sighted at C. It was moved once again, to C, back-sighted onto B before being
sighted onto D. The line between TBM 1 to point A is to act as the reference plane
for the site (taken as zero degrees: 0° 0' 0"). Note that the instrument would not
provide the ability to zero the horizontal angles before taking a reading.
Instrument
located at
TBM 1
PT B
PT C
Instrument Instrument
sighted
Face
onto
(FL/FR)
FL
FL
FL
FL
FL
FL
A
B
TBM 1
C
BO
D
Horizontal angle reading
Degrees Minutes Seconds
(9)
()
(")
3
0
15
319
20
358
0
106
30
3
10
176
30
50
0
40
5
52
Calculate the whole circle angle (i.e. with reference to line TBM 1-A) for the angle
measured at point C. (angle BCD) and express it as a decimal to 4 decimal places
(enter the angle, in degrees, as a decimal rather than expressing it in degrees.
minutes and seconds:")
Transcribed Image Text:An instrument was set up over TBM 1, and backsights onto point A before sighting onto B. The instrument was then moved to B, back-sighted onto TBM 1 and then sighted at C. It was moved once again, to C, back-sighted onto B before being sighted onto D. The line between TBM 1 to point A is to act as the reference plane for the site (taken as zero degrees: 0° 0' 0"). Note that the instrument would not provide the ability to zero the horizontal angles before taking a reading. Instrument located at TBM 1 PT B PT C Instrument Instrument sighted Face onto (FL/FR) FL FL FL FL FL FL A B TBM 1 C BO D Horizontal angle reading Degrees Minutes Seconds (9) () (") 3 0 15 319 20 358 0 106 30 3 10 176 30 50 0 40 5 52 Calculate the whole circle angle (i.e. with reference to line TBM 1-A) for the angle measured at point C. (angle BCD) and express it as a decimal to 4 decimal places (enter the angle, in degrees, as a decimal rather than expressing it in degrees. minutes and seconds:")
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