SOLUTION: a rectangle is 13 centimeters wide and 18 centimeters long. how long is its diagonal?

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Question 262595: a rectangle is 13 centimeters wide and 18 centimeters long. how long is its diagonal?
Answer by dabanfield(803) About Me  (Show Source):
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a rectangle is 13 centimeters wide and 18 centimeters long. how long is its diagonal?

The diagonal is the hypotenuse of a right triangle with sides 13 and 18. If D is the diagonal, then by the Pythagorean Theorem we know that:
13^2 + 18^2 = D^2
169 + 324 = D^2
D = SQRT(593)