If each side of△ACD above has length 3 and if AB has length 1，what is the area of region BCDE?

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问题

选项 A、
B、
C、
D、
E、

答案B

解析 The area of region BCDE is the area of △ACD minus the area of △ABE. Since AACD is equilateral, its area is

. △ABE is a 30-60-90 triangle with side lengths 1,

, and 2 and area

.Thus, the area of region BCDE is

The correct answer is B.

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