题目内容
求面积.

[3.14×0.82-3.14×(
)2]÷2,
=[3.14×0.64-3.14×0.36]÷2,
=[2.0096-1.1304]÷2,
=0.8792÷2,
=0.4396;
答:阴影部分的面积是0.4396;
| 1.2 |
| 2 |
=[3.14×0.64-3.14×0.36]÷2,
=[2.0096-1.1304]÷2,
=0.8792÷2,
=0.4396;
答:阴影部分的面积是0.4396;
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