单选题
In the figure at the right, 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 14-J) is
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