一个圆柱高90cm，底面直径20cm 一个圆柱形烟囪高8m，底面直径20cm 做一个
\u4e00\u4e2a\u5706\u67f1\u5f62\u5bb9\u5668\uff0c\u5e95\u9762\u534a\u5f84\u662f20cm\uff0c\u9ad8\u662f90cm\uff0c\u91cc\u9762\u88c5\u6709\u9002\u91cf\u7684\u6c34\uff0c\u628a\u4e00\u4e2a\u5e95\u9762\u5468\u957f\u662f125.6\u5398\u89e3\uff1a\u539f\u6765\u6c34\u9762\u9ad8\u5ea6\u4e3a\uff1a75\u00f7\uff081+1/14\uff09=70\uff08\u5398\u7c73\uff09
\u6c34\u9762\u4e0a\u5347\u7684\u9ad8\u5ea6\u4e3a\uff1a75-70=5\uff08\u5398\u7c73\uff09
\u5706\u9525\u7684\u4f53\u79ef\u4e3a\uff1a3.14\u00d720²\u00d75=6280\uff08\u7acb\u65b9\u5398\u7c73\uff09
\u5706\u9525\u7684\u5e95\u9762\u534a\u5f84\u4e3a\uff1a125.6\u00f73.14\u00f72=2\uff08\u5398\u7c73\uff09
\u5706\u9525\u7684\u5e95\u9762\u79ef\u4e3a\uff1a3.14\u00d72²=12.56\uff08\u5e73\u65b9\u5398\u7c73\uff09
\u5706\u9525\u7684\u9ad8\u4e3a\uff1a6280\u00d73\u00f712.56=1500\uff08\u5398\u7c73\uff09
\uff08\u5706\u67f1\u5f62\u5bb9\u5668\u9ad8\u624d90cm\uff0c\u4e0d\u77e5\u9053\u600e\u4e48\u628a\u5706\u9525\u6d78\u6ca1\u7684\uff1f\uff09
380π cm2
18000π cm3
绛旓細鍦嗘煴琛ㄩ潰绉叕寮忔槸锛2蟺r²+2蟺rh = 2x3.14 x r (r+h)鍏朵腑 r 鏄崐寰勩傝棰樼殑 r = 60/2=30cm銆備唬鍏ヤ笂杩板叕寮忥細=2x3.14x30(30+90)=188.4x120 =22608cm^3.绛旇繖涓渾鏌变綋鐨勮〃闈㈢Н鏄22608cm绔嬫柟銆
绛旓細瀹归噺璁＄畻鏂规硶濡備笅锛歏=蟺r²h V=3.14脳锛60梅2锛²脳90=254340锛堢珛鏂瑰帢绫筹級=254.340锛堝崌锛
绛旓細鍥犱负鎬婚珮涓90cm,缂30鍦,鍒欐瘡鍦堣窛绂讳负3鍘樼背,鎯宠薄鍦嗘煴琛ㄩ潰骞抽摵,鍒欎负鏂滅嚎30鏉℃眰鎬婚暱 鏂滅嚎闀=鈭氬懆闀跨殑骞虫柟+3cm鐨勫钩鏂=12.92cm 缁冲瓙鎬婚暱=30*12.92cm=387.58cm
绛旓細浣犺繖涓鐢鍦嗘煴浣撹绠楀叕寮忓氨鍙互绠楀嚭锛屽叕寮忥細蟺r²x楂 璁＄畻寮忥細3.14x鍗婂緞37.5²=126562.5梅1000=126.5625姣崌 甯屾湜甯埌浣犳湜閲囩撼锛
绛旓細16脳3.14脳90=4521.6(骞虫柟鍘樼背)鑺卞竷鑷冲皯鐢ㄤ簡4521.6骞虫柟鍘樼背銆
绛旓細瀹冪殑浣撶Н鏄9450 绔嬫柟鍘樼背 105x90=9450 绔嬫柟鍘樼背
绛旓細鍗婂緞:80脳1/2=40鍘樼背 搴曢潰绉:3.14脳40脳40=5024骞虫柟鍘樼背 渚ч潰绉:3.14脳80脳90=22608骞虫柟鍘樼背 鏃犵洊琛ㄩ潰绉:5024+22608=27632骞虫柟鍘樼背
绛旓細姘撮潰涓婂崌鐨勯珮搴︿负锛75-70=5锛堝帢绫筹級鍦嗛敟鐨勪綋绉负锛3.14脳20²脳5=6280锛堢珛鏂瑰帢绫筹級鍦嗛敟鐨搴曢潰鍗婂緞涓猴細125.6梅3.14梅2=2锛堝帢绫筹級鍦嗛敟鐨勫簳闈㈢Н涓猴細3.14脳2²=12.56锛堝钩鏂瑰帢绫筹級鍦嗛敟鐨勯珮涓猴細6280脳3梅12.56=1500锛堝帢绫筹級锛鍦嗘煴褰㈠鍣ㄩ珮鎵90cm锛涓嶇煡閬撴庝箞鎶婂渾閿ユ蹈娌＄殑锛燂級...
绛旓細pai*0.16*0.9*瀵嗗害
绛旓細52*3.14*70梅1000
