Apply the Pythagorean Theorem. The Pythagorean Theorem states that in a right triangle, a^2 + b^2 = c^2 where c is the hypotenuse.
a^2 + b^2 = c^28^2 + 5^2 = c^264 + 25 = c^289 = c^2√89 = √c^2c = √89
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