AMC 8 2011 Problem 19
AMC8 2011 年第 19 题
基本计数原理★★★☆☆
How many rectangles are in this figure?
下图中有多少个长方形?
- A.8
- B.9
- C.10
- D.11
- E.12
正确答案 · Correct Answer
D
解析 · Solution
Solution 1
Partition the figure into non-overlapping regions as shown. The list of rectangles are 𝑏, 𝑐, 𝑑, 𝑎 𝑏, 𝑏 𝑐, 𝑐 𝑑, 𝑐 𝑓, 𝑑 𝑒, 𝑎 𝑏 𝑐 𝑑, 𝑏 𝑐 𝑓 𝑔 b,c,d,ab,bc,cd,cf,de,abcd,bcfg, and 𝑐 𝑑 𝑒 𝑓 cdef. Answer: 𝐷 D .
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