191问答库 > 以点O为圆心，先画一个直径为4厘米的半圆，再计算出这个半圆的周长和面积

以点O为圆心，先画一个直径为4厘米的半圆，再计算出这个半圆的周长和面积

2025-03-16 22:35:20
推荐回答（1个）
回答1：

作图如下：



3.14×4÷2+4=10.28（厘米）；
3.14×（4÷2） 2 ÷2=6.28（平方厘米）；
答：这个半圆的周长为10.28厘米，面积为6.28平方厘米．

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