Posted by **Dale** on Monday, September 20, 2010 at 4:09pm.

Need help with this problem! Thanks in advance.

The ground clearance of an overhead electrical cable must be determined. Surveyor B is

positioned directly under the cable (surveyor B can make a position check by sighting

past the string of a plumb bob, held in his or her outstretched hand, to the cable); surveyor A sets the clinometer to 45°and then backs away from surveyor B until the over-

head electrical cable is on the cross-hair of the leveled clinometer. At this point,surveyors A and B determine the distance between them to be 36.5 ft (see figure). Surveyor A then sets the clinometer to 0°and sights surveyor B; this horizontal line of sight

cuts surveyor B at the knees, a distance of 2.2 ft above the ground.

Determine the ground

clearance of the electrical cable, show your work.

- Math ( Surveying ) -
**MathMate**, Monday, September 20, 2010 at 4:18pm
The clinometer shows 45°, so for an isosceles triangle, the horizontal and vertical distances are the same, namely 36.5 ft.

The clinometer is at the same level as surveyor's knees, namely 2.2 ft. above ground level.

The ground clearance is therefore the sum of the two.

Note: it is extremely dangerous to try to

- Math ( Surveying ) -
**John**, Monday, February 14, 2011 at 3:36pm
38.7

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