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Use Pythagoras' theorem: a2+b2 = c2 and the square root of c2 is the length of the hypotenuse.
the reason you use letters in algebraic expressions is because you don't know the number so a letter replaces it.
TAN on your calculator means TANGENT. In Pythagoras Theorem. Try googling about Pythagoras Theorem and it will answer your questions. Hope this helps.
use a calculator