A thin peice of wire 40m long is cut into 2 pieces. One piece is used to form a circle with radius r, and the other piece 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. pie r^2
B. pie r^2 +10
C. pie r^2 + (1/4) pie^2 r^2
D. pie r^2 + (40-2pie r)^2
E. pie r^2 + (10-(1/2)pie r)^2