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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单项选择题
In the rectangular coordinate system，segment OP is rotated counterclockwisethrough an angle of 90° to position OQ(not shown)． （）

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 area of the circular region with center O is 16π，and v，w．x，y and z represent the lengths Of the line segments． （）

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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