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阴影部分的面积是40平方厘米 求圆环的面积
如图，涂色部分的面积是40平方厘米，这个圆环的面积是多少？
小学数学经典题型讲解15/58
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![来安县气象台发布大雾橙色预警[II级/严重]](http://p3-sign.bdxiguaimg.com/tos-cn-p-0015/osYEMMY1tfp3eneEqs04AIeHeiFQgQH4A4nzbg~tplv-pk90l89vgd-fglass:864:486:90.jpeg?appId=32&channelId=0&customType=custom%2Fnone&from=101_middle_image&imageType=list&isImmersiveScene=0&is_stream=0&lk3s=9d3f5bff&logId=20241029231938F9F482157D6F64B52564&requestFrom=101&x-expires=1761751179&x-signature=1qMRZGMYXJCWs9zjlKbMMut%2B604%3D)
