单项选择题

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？（）

A.A
B.B
C.C
D.D

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单项选择题

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

单项选择题

In the figure below, equilateral triangle ABC is inscribed in circle O, whose radius is 4. Altitude BD is extended until it intersects the circle at E. What is the length of DE？（）

A.A
B.B
C.C
D.D
E.E