单项选择题

If the circumference of the circle above is 16π, and if the length of AC equals the length of BD, what is the length of AC （）

A.
B.16
C.
D. 32
E. 16π

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单项选择题

If the radius of a circular region were decreased by 20 percent, the area of the circular region would decrease by what percent （）

A. 16%
B. 20%
C. 36%
D. 40%
E. 44%

单项选择题

The water level in a tank is lowered by 6 inches, then raised by inches, and then lowered by 4 inches. If the water level was x inches before the changes in level, which of the following represents the water level, in inches, after the changes （）

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

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