=扇形BCD面积-半圆面积
=1/4×4²×3.14-1/2×2²×3.14
=4×3.14-2×3.14
=2×3.14
=6.28平方厘米
如图,已知ABCD是正方形,边长为4厘米,弧CD的直径为CD,弧BD的半径为CD,求所示的阴影部分的周长和面积,
如图,已知ABCD是正方形,边长为4厘米,弧CD的直径为CD,弧BD的半径为CD,求所示的阴影部分的周长和面积,
数学人气：138 ℃时间：2019-12-14 19:09:44
优质解答
阴影面积
=扇形BCD面积-半圆面积
=1/4×4²×3.14-1/2×2²×3.14
=4×3.14-2×3.14
=2×3.14
=6.28平方厘米
=扇形BCD面积-半圆面积
=1/4×4²×3.14-1/2×2²×3.14
=4×3.14-2×3.14
=2×3.14
=6.28平方厘米
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