六年级上册数学圆的阴影部分面积和周长重难点题型
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简介
六上数学重点题‖圆阴影部分面积和周长 计算周长 C=4π÷2+3×2+4 =2π+10 =16.28(dm) C=40×2+2×π×20 =80+40π =205.6(cm) C=π×6+6×4 =6π+24 =42.84(cm) C=8π÷2 =4π =12.56(cm) C=4π+4×2 =4π+8 =20.56(cm) C=10π×2 =20π =62.8(cm) 3×2-4=2(cm) C=3π+4π+2+4 =7π+6 =27.98(cm) C=3×4×π =12π =37.68(m) C=10π+5π =15π =47.1(cm)
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