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Guy West Bridge East Tower Height above Sea Level Measurement
Figure 1. Diagram of Total Station Locations, Measurement Angles and
Distances
Geometry
C = 180Þ - A - D (The sum of the angles of a triangle = 180˚)
sinC sinA
(c)sinA
(The law of Sines)

 a=
c
a
sinC


h = (a)sin   h =
(c)sinAsin 
sinC
Tower Height above Sea Level (TH) = h + s

1
Measurement Data from John German, PE on 9/20/06
s = 40.132 ft.
c = 93.065 ft.
D = 135˚, 13’, 54”
A = 40˚, 02’, 32”
 = 7˚, 11’, 18”
Conversions
1’ = (1/60)˚
1” = (1/3600)˚
Reference:
http://id.mind.net/~zona/mmts/trigonometryRealms/degMinSec/degMinSec.ht
m
Find the Height of the East Tower above Sea Level. (Show your conversion
and calculation work.) Due 9/2706
2
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