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英语翻译Arectangularrugcovershalfofarectangularfloorthatis9feetwideand12feetlong.Ifthedimensionsoftherugareinthesameratioasthoseofthefloor,howmanyfeetlongistherug?A6B21/2C2根号7D6根号2E4根号6

题目详情
英语翻译
A rectangular rug covers half of a rectangular floor that is 9 feet wide and 12 feet long.If the dimensions of the rug are in the same ratio as those of the floor,how many feet long is the rug?
A 6 B 21/2 C 2根号7 D 6根号2 E 4根号6
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答案和解析
一长方形地毯正好可以覆盖半块长12英尺宽9英尺的长方形的地面,如果地毯的长与宽的比例与地面相同,那么地毯长是多少?
首先,由地毯面积是地面面积一半知地毯面积是54,然后由于长与宽比例为4:3,所以长为6根号2,选D.