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 square regions in terms of r?
1) πr^2
2) πr^2 + 10
3) πr^2 + 1/4π^2r^2
4) πr^2 + (40 - 2πr)^2
5) πr^2 + (10 - 1/2πr)^2
the answer is 5
1) πr^2
2) πr^2 + 10
3) πr^2 + 1/4π^2r^2
4) πr^2 + (40 - 2πr)^2
5) πr^2 + (10 - 1/2πr)^2
the answer is 5
