单选题
In the figure below, ABCD is a square and AED is an equilateral triangle. If AB = 2, what is the area of the shaded region?
【正确答案】
E
【答案解析】Use TACTIC 5: subtract to find the shaded area. The area of the square is 4. The area of the equilateral triangle (see Section 11-J) is[*] So the area of the shaded region is[*]