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歡迎您訪問數學考題練習:一個圓錐的側面展開圖是一個半徑為6的半圓,則此!

數學考題練習:一個圓錐的側面展開圖是一個半徑為6的半圓,則此

更新時間:2024-01-12 16:43:48作者:貝語網校

一個圓錐的側面展開圖是一個半徑為6的半圓,則此圓錐的底面半徑是

A.6

B.3

C.2

D.

試題答案

B

試題解析

利用弧長公式和圓的周長公式求解.

解答:設底面半徑為R,

則扇形的弧長=×2π×6=2πR,

∴R=3.

故選B.

點評:本題利用了弧長公式和圓的周長公式求解.

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