一个圆柱形水池的底面半径是4米,池深1.2米,在池的内壁和底面抹上水泥,抹水泥部分的面积是多少平方米? 一个圆柱形水池,从里面量底面直径是4米 池深1.5米 要在水...
\u4e00\u4e2a\u5706\u67f1\u5f62\u6c34\u6c60,\u5e95\u9762\u534a\u5f84\u662f4m,\u6c60\u6df11.2\u7c73\u3002\u5728\u6c60\u7684\u5185\u58c1\u4e0e\u5e95\u9762\u62b9\u4e0a\u6c34\u6ce5,\u62b9\u6c34\u6ce5\u90e8\u5206\u7684\u9762\u79ef\uff1f\u5e95\u9762\u79ef=3.14*4*4=50.24\u5e73\u65b9\u7c73
\u4fa7\u9762\u79ef=3.14*4*2*1.2=30.144\u5e73\u65b9\u7c73
\u62b9\u6c34\u6ce5\u90e8\u5206\u7684\u9762\u79ef=50.24+30.144=80.384\u5e73\u65b9\u7c73
\u5e95\u9762\u79ef=3.14*\uff084/2\uff09^2=12.56\u5e73\u65b9\u7c73
\u4fa7\u9762\u79ef=3.14*4*1.5=18.84\u5e73\u65b9\u7c73
\u5219\u603b\u9762\u79ef=12.56+18.84=31.4\u5e73\u65b9\u7c73
\u9700\u8981\u6c34\u6ce5\u4e3a 2.5*31.4=78.5\u5343\u514b
(1)内壁表面积S1:S1=πdh;S1=π×4×2×1.2=9.6π
(2)池底面积S2:S2=πr²;S2=π×4²=16π
(3)计算总面积S:S=S1+S2=9.6π+16π=25.6π≈80.425㎡
答:抹水泥部分的面积是80.425㎡
内壁表面积=πdh:4×2×π×1.2=9.6π
地面积=πr²:4²×π=16π
总面积:9.6π+16π=25.6π≈80.384㎡
∴抹水泥部分的面积是34.6656平方米
16派+8派*1.2=25.6派。呵呵,手机打的不太方便。楼主见谅
4×4×π +2π×4×1.2=80.384(平方米)
绛旓細鍗婂緞锛4绫 杩欎釜姘存睜鍗犲湴闈㈢Н鏄細鍗婂緞X鍗婂緞X3.14锛4x4x3.14=50.24骞虫柟绫 浣撶Н锛50.24X2.5锛125.6绔嬫柟绫
绛旓細搴曢潰绉3.14脳4脳4=50.24骞虫柟绫 搴曢潰鍛ㄩ暱3.14脳2脳4=25.12绫 鎵浠ヤ晶闈㈢Н25.12脳5=125.6骞虫柟绫 鎵浠ラ潰绉槸50.24+125.6=175.84骞虫柟绫
绛旓細1.闈㈢Н=4脳4脳3.14+2脳4脳3.14脳1.5=87.92骞虫柟绫 姘存偿=87.92脳2.5=219.8鍗冨厠 2. 瀹圭Н=4脳4脳3.14脳1.5=75.36绔嬫柟绫 姘=75.36脳1=75.36鍚
绛旓細搴曢潰绉槸蟺r^2=16蟺骞虫柟绫
绛旓細搴曢潰绉細4脳4脳3.14=50.24锛堝钩鏂圭背锛変晶闈㈢Н锛4脳2脳3.14脳1.5=37.68锛0鍒嗙背锛夋姽姘存偿鐨勯潰绉細50.24+37.68=87.92锛堝钩鏂圭背锛夎兘钃勬按锛4脳4脳3.15脳1.5=75.36锛堢珛鏂圭背锛
绛旓細=(4)^2*3.14*3*1000=150720鍗囨按锛 鍚150.72鍚
绛旓細浣犲ソ锛氬簳闈㈢Н=3.14脳4²=50.24锛堝钩鏂圭背锛夎搫姘存睜娣=31.4梅50.24=0.625锛堢背锛鍦嗘煴鐨楂=浣撶Н梅搴曢潰绉
绛旓細3.14脳4^2脳1=50.24绔嬫柟绫
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绛旓細瑙o細鎶规按娉鐨闈㈢Н搴旀槸渚ч潰绉姞涓搴曢潰绉 3.14脳4脳1.2+3.14脳锛4/2锛²锛=3.14脳4.8+3.14脳4锛=3.14脳8.8锛=27.632锛堝钩鏂圭背锛夛紱