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Survey Equipment

A surveyor intends to create a bridge across a river. There is a tall tree on the other side of the river. He?

A surveyor intends to create a bridge across a river. There is a tall tree on the other side of the river. He measures a line down his side of the river for 125 feet. At each side of this line he uses his surveying equipment to measure the angle to the tree on the other side of the river. At the beginning of the line, the angle to the tree was 65°10', at the end of the line the angle to the tree is 60°10'. If he wants the bridge to go from where he started his line to the tree, then how long will the bridge be?

The sum of the interior angles of a triangle is 180 degrees.
Change angles to decimal degrees 65 deg 10 min = 65 deg * 10/60 = 65.167 deg.
180 - 65.167 - 60.167 = 54.667 degrees Angle A = 60.167 ; Angle B = 65.167 ; C = 54.667
(a / sin A ) = (b / sin B) = (c / sin C) Let side " a " be the begining of line to tree which is also Angle B
Remember that the side is always opposite its angle thus side a is opposite Angle A
a= [c ( sin A)] / sin C this becomes a = [125 ( sin 60.167)] / sin 54.667
a = 132.92 feet

Find Survey Equipment On eBay Below:

Optical Automatic Level Johnson 40 6962
Optical Automatic Level Johnson 40 6962
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Ashtech 730096 Cable Assembly 37 P I O Cable
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Spectra GDM 610 S 571 202 003 Geodimeter Pro Construction Survey Total Station
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Leica TCRA1103 667296 Reflectorless Robotic Surveying Construction Total Station
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Trimble 5603 DR 200+ Direct Reflex 3 Robotic Prism Total Station Theodolite
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Spectra Precision Fully Robotic Total Station 24gHz radio Focus 30 3
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Trimble Shoulder Carrying Bag Messenger Case With Survey Rod
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Topcon PZS rover kit machine control sensor MM GPS
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Johnson 40 6543 Self Leveling Rotary Laser Level
Johnson 40 6543 Self Leveling Rotary Laser Level
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parallel plate micrometer for NA2 Level
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Keuffel  Esser K+E Alignment Telescope C9092 2 71 2021 EXCELLENT 88205 533
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CST berger 60 ALQCI20 O 5 8 Inch 11 Threaded Flat Head Tripod
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Bosch 30 ft Self Leveling Cross Line Laser Level With Mounting Device and Belt
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BRADY Plastic Sheet Pipe MrkrChilled Water Supply6 to7 7 8 4024 F
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MEASURE MASTER 360 HORIZONTAL VERTICAL LEVELING ROTARY LASER KIT MODEL MMR
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leica rvl100 receiver lino laser receiver for use with line lasers red black
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VINTAGE DAVID WHITE MODEL 52086 SURVEY TRANSIT LEVEL NR
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