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'
Ratios
A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.
Trigonometric Ratios
Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.
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
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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