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歡迎您訪問數學考題練習:如圖,一個圓桶兒,底面直徑為6cm,高為8cm!

數學考題練習:如圖,一個圓桶兒,底面直徑為6cm,高為8cm

更新時間:2024-01-12 16:42:09作者:貝語網校

如圖,一個圓桶兒,底面直徑為6cm,高為8cm,則一只小蟲從底部點A沿表面爬到上底B處,則小蟲所爬的最短路徑長是________.(用π表示最后結果)

試題答案

試題解析

先將圓柱的側面展開為一矩形,而矩形的長就是底面周長的一半,高就是圓柱的高,再根據勾股定理就可以求出其值.

解答:解:展開圓柱的側面如圖,根據兩點之間線段最短就可以得知AB最短.由題意,得

AC=3π,在Rt△ABC中,由勾股定理,得

AB==cm.

故答案為:cm.

點評:本題考查了圓柱側面展開圖的運用,兩點之間線段最短的運用,勾股定理的運用.在解答時將圓柱的側面展開是關鍵.

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