这个圆的半径是多少厘米？在一张长6厘米、宽4厘米的长方形约上画一个最大的圆，这个圆的半径是多少厘米？如果画一个最大的半圆，这个半圆的半径是多少厘米？

数学题解答：宽是4厘米的话，最大的正方形边长就是4厘米，所以圆的半径就是2厘米（4÷2=2）；如果画最大的半圆，宽要是长的一半，所以这个圆的半径是3厘米（6÷2＝3）。

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