A thin piece of wire 40 meters long is cut into tow 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 meters, of the circular and the square regions in the term of r?
1 pi*r^2
2. pi*r^2 +10
3. pi*r^2 +1/4pi^2*r^2
4. pi*r^2+(40-2pi r)^2
5. pi*r^2+(10-1/2pi*r)2
1 pi*r^2
2. pi*r^2 +10
3. pi*r^2 +1/4pi^2*r^2
4. pi*r^2+(40-2pi r)^2
5. pi*r^2+(10-1/2pi*r)2
