The line of sight of an alidade on a plane table is directed towards the tip of an observation tower 362.50m away at an angle of +17°30'. The height of the tower is 135.0 m and the line of sight is 1.25m above the ground. If the elevation of the base of the tower above datum is 476.95m A.) Determine the elevation of the ground directly under the table. B.) Determine the elevation of the ground directly under the table if the observed vertical angle is instead -17°30'

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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ELEVATION BY PLANE TABLE. The line of sight of an alidade on a plane table is directed towards the tip of an observation tower 362.50m away at an angle of +17°30'. The height of the tower is 135.0 m and the line of sight is 1.25m above the ground. If the elevation of the base of the tower above datum is 476.95m

A.) Determine the elevation of the ground directly under the table.

B.) Determine the elevation of the ground directly under the table if the observed vertical angle is instead -17°30'.

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