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No, trigonometry can be used with any triangle, right angle or not.

While the primary trigonometric functions are defined in relation to right triangles with hypoteneuse equal to 1, that is just a special case where the function is easier to define. Sine (theta), for instance, is opposite over hypotenuse, where the angle on the other end of adjacent is a right angle. Even if you don't have a right angle, the functions can help you find a superposition of a right triangle on any triangle, and that can help you solve many different kinds of problems.

The laws of sines and cosines, for instance, apply to any triangle.

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Q: Can trigonometry be used with right triangles only?
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