修改时间:2024-07-13 浏览次数:310 类型:期末考试
如图②所示,将长方形纸片剪两刀,剪出三个角(∠BAE , ∠AEC , ∠ECD),∠BAE+∠AEC +∠ECD=360(度);
⑴如图③所示,将长方形纸片剪三刀,剪出四个角(∠BAE , ∠AEF , ∠EFC , ∠FCD), 则∠BAE+∠AEF+∠EFC+∠FCD=(度);
⑵如图④所示,将长方形纸片剪四刀,剪出五个角(∠BAE , ∠AEF , ∠EFG , ∠FGC , ∠GCD), 则∠BAE+∠AEF+∠EFG+∠FGC+∠GCD=(度);
⑶根据前面的探索规律,将本题按照上述剪法剪n刀,剪出n+1个角,那么这n+1个角的和是(度).
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