题目

Imagine a mass of floating waste is two times the size of the state of Texas. Texas has a land area of more than 678,000 square kilometers. So it might be difficult to imagine anything twice as big. All together, this mass of waste flowing in the North Pacific Ocean is known as the Great Pacific Ocean Garbage Patch ( 太平洋上的垃圾带). It weighs about 3,500,000 tons. The waste includes bags, bottles and containers—plastic products of all kinds. The eastern part of the Great Pacific Garbage Patch is about 1,600 kilometers west of California. The western part is west of the Hawaiian I如图，⊿OAB的顶点的坐标为（4，0），把⊿OAB沿轴向右平移得到⊿CDE，如果那么的长为    ▲    ．