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
Dan drove home from college at an average rate of 60 miles per hour. On his trip back to college, his rate was 10 miles per hour slower and the trip took him one hour longer than the drive home. How far is Dan’s home from the college
A. 65 miles
B. 100 miles
C. 200 miles
D. 280 miles
E. 300 miles
单项选择题
Three carpet pieces in the shapes of a square, a triangle, and a semicircle are attached to one another, as shown in the figure above, to cover the floor of a room. If the area of the square is 144 feet and the perimeter of the triangle is 28 feet, what is the perimeter of the room’s floor, in feet（）

A. 32+12π
B. 40+6π
C. 34+12π
D. 52+6π
E. 52+12π
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