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A thin piece of wire 40 meters long is cut into two pieces. [#permalink]
12 Oct 2008, 21:22
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A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. NO wire is left over. Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r? a. pi r^2 b.pi r^2 +10 c. pi r^2 + (1/4) (pi^2)(r^2) d. Pi r^2 + (40-2pir)^2 e. pi r^2 + (10 - (1/2)pi r)^2