![]() Measurement with angles: When direct measurement of height is not possible, a surveyor resorts to trigonometry This principle can be applied for measuring the height of any object that does not offer the convenience of dropping a measuring tape from top to bottom, or if you can’t climb to the top to use sophisticated instruments. In a right-angled triangle, one of the angles is already known, so if we know any other angle and one of the sides, the others can be found out. If we know any three of these quantities, provided one of them is a side, all the others can be calculated. There are three sides and three angles in any triangle. ![]() The basic principle that was used earlier is very simple, and uses only trigonometry which most of us are familiar with, or at least can recall.
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