A landscaper is constructing a rectangular garden. The width of the garden measures 9 feet and the length is 12 feet. What should the length of the diagonal measure be to ensure that the garden is a rectangle?
This questions asks for the hypotenuse of a triangle with legs of 9 and 12. You could square both numbers and sum them, then take the square root.
The better, and faster way, is to recognize the 3,4,5 pattern and, in your head, quickly figure the hypotenuse to be 15.
This question came from a PSAT practice test.
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