一个圆柱体形的蓄水池,从里面量底面周长31.4米,深2.4米,在它的内壁与底面抹上水泥. (1) 抹水泥部分的面
\u4e00\u4e2a\u5706\u67f1\u4f53\u5f62\u7684\u84c4\u6c34\u6c60\uff0c\u4ece\u91cc\u9762\u91cf\u5e95\u9762\u5468\u957f31.4\u7c73\uff0c\u6df12.4\u7c73\uff0c\u5728\u5b83\u7684\u5185\u58c1\u4e0e\u5e95\u9762\u62b9\u4e0a\u6c34\u6ce5\uff0e\uff081\uff09\u62b9\u6c34\u6ce5\u90e8\u5206\u7684\uff081\uff09\u6c34\u6c60\u7684\u4fa7\u9762\u79ef\uff1a31.4\u00d72.4=75.36\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u6c34\u6c60\u7684\u5e95\u9762\u79ef\uff1a3.14\u00d7\uff0831.4\u00f73.14\u00f72\uff092\uff0c=3.14\u00d752\uff0c=3.14\u00d725\uff0c=78.5\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u62b9\u6c34\u6ce5\u90e8\u5206\u7684\u9762\u79ef\u662f\uff1a75.36+78.5=153.86\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u62b9\u6c34\u6ce5\u90e8\u5206\u7684\u9762\u79ef\u662f153.86\u5e73\u65b9\u7c73\uff0e\uff082\uff09\u6c34\u6c60\u7684\u4f53\u79ef\uff1a3.14\u00d752\u00d72.4=3.14\u00d725\u00d72.4=188.4\uff08\u7acb\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u84c4\u6c34\u6c60\u7684\u5bb9\u79ef\u662f188.4\u7acb\u65b9\u7c73\uff0e
\u5e95\u9762\u534a\u5f84\u662f\uff1a31.4\u00f73.14\u00f72=5\uff08\u7c73\uff09\uff1b\u5e95\u9762\u79ef\u662f\uff1a3.14\u00d752\uff0c=3.14\u00d725\uff0c=78.5\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u4fa7\u9762\u79ef\u662f\uff1a3.14\u00d75\u00d72\u00d72.4=75.36\uff08\u5e73\u65b9\u7c73\uff09\uff0c\u6240\u4ee5\u62b9\u6c34\u6ce5\u7684\u9762\u79ef\u662f\uff1a78.5+75.36=153.86\uff08\u5e73\u65b9\u7c73\uff09\uff0c\u7b54\uff1a\u62b9\u6c34\u6ce5\u7684\u9762\u79ef\u662f153.86\u5e73\u65b9\u7c73\uff0e
半径=31.4÷2÷3.14=5米高=2.4米
抹水泥的面积
=侧面积+底面积
=2×3.14×5×2.4+3.14×5²
=153.86平方米
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