4). Find the length of side a in the right triangle, if b equals = 1212 and c equals = 1515.
a equals = ___________
(Simplify your answer. Type an exact answer, using radicals as needed.)
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a = sqrt(c^2-b^2) = sqrt(1515^2-1212^2) = 101*sqrt(15^2-12^2) = 909
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