一个圆柱形蓄水池，从里面量底面周长是31.4，深2米，在它的内壁与地面 一个圆柱型的蓄水池，从里面量底面是31.4米，深2米，在它的...
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(\u5982\u679c\u5e95\u9762\u5468\u957f\u662f31.4\u7c73\uff0c\u5219)
\u5e95\u9762\u534a\u5f84\u662f31.4\u00f7(2\u00d73.14)=5\u7c73
\u62b9\u6c34\u6ce5\u7684\u9762\u79ef\u662f3.14\u00d7(5²+2\u00d75\u00d72)=141.3\u5e73\u65b9\u7c73
一个圆柱形蓄水池，从里面量底面周长是31.4，深2米，在它的内壁与地面抹上水泥。
抹水泥的部分面积是多少平方米？
31.4÷3.14÷2=5
31.4x2+3.14x5x5
=62.8+78.5
=141.3平方米
2.蓄水池能蓄水多少吨？（每立方水重一吨）
3.14x5x5x2=157立方米
157x1=157吨
C=πd=31.4得直径d=1m,S底=πd²/4=0.785平方米，S侧面积=Ch=31.4x2=62.8平方米，S总=63.585平方米。V=S底h=0.785x2=1.57立方米
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