2004 AMC 10B 第 8 题

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所有题目均经美国数学协会(MAA)官方合法授权使用。

8.

Minneapolis-St. Paul International Airport 位于 St. Paul 市中心西南 88 英里处,也位于 Minneapolis 市中心东南 1010 英里处。下列哪个数最接近 St. Paul 市中心与 Minneapolis 市中心之间的英里数?

Minneapolis-St. Paul International Airport is 88 miles southwest of downtown St. Paul and 1010 miles southeast of downtown Minneapolis. Which of the following is closest to the number of miles between downtown St. Paul and downtown Minneapolis?

1313

1414

1515

1616

1717

答案:A
知识点:勾股定理估算
难度评级:1030
小提示:

西南方向和东南方向互相垂直。

Southwest and southeast are perpendicular directions

大提示:

距离为 82+102\sqrt{8^2 + 10^2},再估计最接近的整数。

The distance is 82+102\sqrt{8^2 + 10^2}; estimate the nearest whole number

解答:

两个给定方向互相垂直,因此机场位于一个直角三角形的直角顶点,两条直角边为 881010

两个市中心之间的距离为 82+102=16412.8\sqrt{8^2 + 10^2} = \sqrt{164} \approx 12.8,最接近 1313

所以正确答案是 A

The two given directions are perpendicular, so the airport sits at the right angle of a right triangle with legs 88 and 10.10.

The distance between the downtowns is 82+102=16412.8,\sqrt{8^2 + 10^2} = \sqrt{164} \approx 12.8, which is closest to 13.13.

Thus, the correct answer is A.

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