Matt H. answered 01/19/15
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PATIENT :-) Elem/Middle MATH and WRITING; HS SAT and COLLEGE ESSAYS!
Because the given angle is 45 degrees, you know that the missing angle is also 45 degrees. And because the angles are the same, their opposite sides are the same lengths, in this case 8 feet.
Using the Pythagorean theorem, you'll see that the hypotenuse will be the square root of 128, which is 11.3
Hope this helps!
Matt