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Principally in surveying by triangulation: you divide the countryside into imaginary adjacent triangles, each lying on a plane in three-dimensions (E-W, N-S and altitude) between defined points on the ground, so a lot of advanced trigonometry is necessary to calculate the co-ordinates of the triangles' apices. Nowadays large-areas maps are generated from satellite images but triangulation is still necessary for small-scale work such as in building and civil-engineering detail mapping and setting-out.

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Q: How trigonometry used in geography?
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