问题
解答题
用圆规画圆，并计算出圆的面积和周长．
（1）画出直径是4厘米的圆．
（2）计算出圆的面积和周长．（广州市黄埔区）
答案
（1）作图如下：
（2）4÷2=2（厘米），
3.14×22=12.56（平方厘米），
3.14×4=12.56（厘米）．
答：圆的面积是12.56平方厘米，周长是12.56厘米．
搜题请搜索小程序“爱下问搜题”
用圆规画圆，并计算出圆的面积和周长．
（1）画出直径是4厘米的圆．
（2）计算出圆的面积和周长．（广州市黄埔区）
（1）作图如下：
（2）4÷2=2（厘米），
3.14×22=12.56（平方厘米），
3.14×4=12.56（厘米）．
答：圆的面积是12.56平方厘米，周长是12.56厘米．
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