六年级上册数学阴影部分的周长必做题
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简介
C=4×3.14×+3×2+4 =6.28+10 =16.28(cm) C=5×3.14×+4.5×2+7+(7-5) =15.7×+18 =25.85(cm) C=4×3.14+4×2 =12.56+8 =20.56(cm) C=4×2×3.14×+4×3.14 =8×3.14×+12.56 =6.28+12.56 =18.84(cm)
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