Fencing a region A farmer plans to use 180 feet of fencing to enclose a rectangular region, using part of a straight river bank instead of fencing as one side of the rectangle, as shown in the figure. Find the area of the region if the length of the side parallel to the river bank is
(a) twice the length of an adjacent side.
(b) one-half the length of an adjacent side.
(c) the same as the length of an adjacent side.
EXERCISE
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