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面積比9:1 可知,周長比為3:1 大圓3x小圓x 3x-x=12.56 x=6.28 小圓半徑=6.28/(2*3.14)=1cm 大圓半徑為3cm 面積差=3.14*3*3 - 3.14*1*1=25.12平方釐米
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