3.5*2=7
7*3.14+5*3.14=阴影周长
如图,大半圆的半径是3.5厘米,小半圆的直径是5厘米,求阴影部分的周长.
如图,大半圆的半径是3.5厘米,小半圆的直径是5厘米,求阴影部分的周长.
不会?
不会?
数学人气：101 ℃时间：2019-10-23 05:18:09
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