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  3. The rectangular rug shown in the figure above has a floral border 1 foot wide on all sides. What is the area, in square feet, of

The rectangular rug shown in the figure above has a floral border 1 foot wide on all sides. What is the area, in square feet, of

admin2012-10-19  9
问题
The rectangular rug shown in the figure above has a floral border 1 foot wide on all sides. What is the area, in square feet, of that portion of the rug that excludes the border?
选项 A、28
B、40
C、45
D、48
E、53
答案A
解析 左图所示的长方形地毯在各边均有1英尺宽的花边。以平方英尺为单位，地毯的非花边部分的面积是多少?
解：本题的正确答案为(A)。由花边宽1英尺可知，这块地毯去除花边后，长和宽分别为7英尺和4英尺，所以其面积=7×4=28平方英尺。
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