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one end of an 80-inch-long paper strip is showed in the figu

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one end of an 80-inch-long paper strip is showed in the figure above.The notched edge ,shown in bold,was formed by removing an equilateral triangle from the end of each 4-inch length on one edge of the paper strip.What is the total length,in inches,of the bold notched edge on the 80-inch paper strip?
one end of an 80-inch-long paper strip is showed in the figu
在一个80英寸长的纸条,从每4英寸长的一个纸条的边缘上减去一个等边三角形,组成的总长度是多少的缺口!