AMC 8 2009 Problem 9
AMC8 2009 年第 9 题
四边形与多边形★★☆☆☆
Construct a square on one side of an equilateral triangle. On one non-adjacent side of the square, construct a regular pentagon, as shown. On a non-adjacent side of the pentagon, construct a hexagon. Continue to construct regular polygons in the same way, until you construct an octagon. How many sides does the resulting polygon have?
在一个等边三角形的一边上作一个正方形，然后在此正方形的另一条非相邻边上作一个正五边形，如下图所示。再在此五边形的一条非相邻边上作一个六边形。按照这种方法不断作出正多边形，直到作出一个八边形。那么最终形成的多边形有多少条边？
- A.21
- B.23
- C.25
- D.27
- E.29
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
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