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Points A, B, C, and D are on the perimeter of a triangular garden. The length of AB is 3 feet, the length of BC is 5 feet, and the length of AD is 4 feet. How many feet greater than the distance from point D to point B is the distance from point D to point C?
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. Now let's use the Pythagorean theorem to find the length of hypotenuse CD. The Pythagorean theorem says that in a right triangle with a hypotenuse of length c and legs of lengths a and b, it is always true that 
. In right triangle ACD,
, look for a positive integer factor of 80 that is a perfect square. Here, 
and 16 is a perfect square. So
feet, choice (C).