Problem Solving
试题详情
题目：
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?
选项:
A、πr2
B、πr2 + 10
C、πr2 + ¼ π2r2
D、πr2 + (40-2πr)2
E、πr2 + (10- ½ πr)2
答案:
E
