一个圆锥形的铁皮桶,高是15.7分米,侧面积展开正好是正方形,做这样一个铁皮油桶需要多少铁皮?快呀！
,\u4e00\u4e2a\u94c1\u76ae\u6cb9\u6876,\u91cc\u9762\u88c5\u4e86\u534a\u6876\u6cb9,\u628a\u6876\u91cc\u7684\u6cb9\u5012\u51fa\u56db\u5206\u4e4b\u4e00\u540e,\u8fd8\u6709\u6cb93\u5347,\u6cb9\u6876\u7684\u9ad8\u4e3a2\u5206\u7c73,\u6cb9\u6876\u7684\u5e95\u9762\u79ef\u662f\u591a\u5c11\u7b80\u5355\u54e9\uff1a3\u5347=3\u7acb\u65b9\u5206\u7c73
1-\u56db\u5206\u4e4b\u4e00=\u56db\u5206\u4e4b\u4e09
3/\u56db\u5206\u4e4b\u4e09=4\uff08\u7acb\u65b9\u5206\u7c73\uff09
4*2=8\uff08\u7acb\u65b9\u5206\u7c73\uff09
8/2=4\uff08\u5e73\u65b9\u5206\u7c73\uff09
\u7b54\uff1a~~~~~~~~~
\u5e94\u8be5\u770b\u5f97\u61c2\u5427\uff0c\u770b\u4e0d\u61c2\u6211\u7ed9\u4f60\u8bb2\u8bb2 \uff1a\u5148\u7b97\u51fa\u534a\u6876\u6cb9\u7684\u4f53\u79ef\uff0c\u662f4\u7acb\u65b9\u5206\u7c73\uff0c\u518d\u4e582\uff0c\u662f\u4e00\u6876\u6cb9\u7684\u4f53\u79ef\uff0c\u7b49\u4e8e8\uff0c\u7136\u540e\u518d\u7528\u4e00\u6876\u6cb9\u7684\u4f53\u79ef\u9664\u4ee5\u9ad82\u5206\u7c73\uff0c\u5c31\u7b49\u4e8e\u6cb9\u6876\u7684\u5e95\u9762\u79ef\uff0c\u4e5f\u5c31\u7b49\u4e8e4\u5e73\u65b9\u5206\u7c73\u3002
\u7269\u4e1a\u7fa4\uff0c\u4f60\u597d\uff1a
\u6876\u4e2d\u6709\u6cb9\uff1a24\u00f7\uff081\uff0d2/3\uff09\uff1d72\uff08\u5347\uff09
\u6876\u5e95\u9762\u79ef\uff1a72\u00f78\uff1d9\uff08\u5e73\u65b9\u5206\u7c73\uff09
底面圆的直径是 15.7÷3.14＝5 半径是5÷2＝2.5
体积 2.5×2.5×3.14×15.7＝308.1125立方分米≈308.11立方分米
由题意可知铁皮桶高＝铁皮桶底面圆的周长＝1.57米，
铁皮桶底面圆半径＝1.57/（2*3.14），铁皮桶底面圆面积＝3.14*[1.57/（2*3.14）]^2=0.4837
1.57*1.57=2.4649
做这样一个铁皮油桶需要的铁皮为：0.4837*2+2.4649＝4.9487（平方米）
要有π的呀
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