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Trigonometry is used depending on what the problem is.
Measure an angle!
Trigonometry
You could measure the sides of a shape and use trigonometry.
There are an enormous number of uses of trigonometry and trigonometric functions. For instance, the technique of triangulation is used in astronomy to measure the distance to nearby stars, in geography to measure distances between landmarks, and in satellite navigation systems. Wikipedia has a page on the uses of trigonometry. Click on 'related links' below to go to that page.