单项选择题

If the sum of the measures of two angles is180°, each angle is a supplement of the other，whereas．if the sum of their measures is 90°，each is a complement of the other．
 

（）

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.

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单项选择题
A rectangular label is attached to a right circular cylinder with radius r．The label，which encircles the cylinder without overlap，has width w and an area equal to the area of the base of the cylinder．（）

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
The figure above shows a large square formed by fitting three L-shaped tiles and one small square tile together． If are ctangular floor 10 feet by 12 feet is to be tiled in large squares of this design，how many L-shaped tiles will be needed（）

A. 810
B. 405
C. 270
D. 135
E. 45
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