Pythagorean theorum.
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By using trigonometry or using Pythagoras' theorem for a right angle triangle.
A right triangle has three sides. If you label the sides connected to the right angle side A and side B, and the hypotenuse side C, A^2+B^2=C^2.
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Yes simply with a protractor and a measuring device.
If it's a right triangle, use pythagorean's theorem (a2+b2=c2) to solve it. = If it's an oblique triangle, use the law of sines or cosines (see related link)