Trigonometry: A Complete Introduction (Teach Yourself) by Neill Hugh

Author:Neill, Hugh [Neill, Hugh]
Language: eng
Format: azw3
Tags: Trigonometry: A complete introduction
Publisher: Hodder & Stoughton
Published: 2013-05-30T16:00:00+00:00

Figure 6.9

From a suitable point Q, use a theodolite to measure the angle θ°.

Then measure a distance PQ, call it d, so that B, P and Q are in a straight line.

Then measure the angle Φ°.

• In triangle APQ, you can calculate the length AQ.

• Then, in triangle AQB, you can calculate h.

3 BY MEASURING A HORIZONTAL DISTANCE IN ANY DIRECTION

It may not be easy to obtain a distance PQ as in the previous example, where B, P and Q are in a straight line.

You can then use the following method.

In Figure 6.10 let AB be the height you need to find.

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