Deanna L. answered 10/02/14
Tutor
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Electrical engineering major and music lover with MIT degree
Alina,
This problem uses the Pythagorean principle which means that the diagonal is the hypotenuse of a triangle with the legs being the length and width. Thus, the hypotenuse is the square root of 10 squared plus 9 squared = square root of 181. Hope that helps!
Alina L.
10/02/14