单项选择题

In the figure at the right, WXYZ is a square whose sides are 12. AB, CD, EF, and GH are each 8, and are the diameters of the four semicircles. What is the area of the shaded region（）

A.144-128π
B.144-64π
C.144-32π
D.144-16π
E.16π

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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

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.