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

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