圆型水池高是4.5米直径是9.2米表面积是多少? 请问一个空心圆台,上底大圆直径为9.2米,小圆直径为8米,高...
\u76f4\u5f849.2\u7c73\u5706\u5f62\uff0c\u5b83\u7684\u5e73\u65b9\u662f\u591a\u5c11\uff1f\u534a\u5f84 9.2\u00f72=4.6\u7c73
\u9762\u79ef 4.6x4.6x3.14=66.4424 \u5e73\u65b9\u7c73
V =V\u5706\u53f0-V\u5706\u67f1
=[S\u4e0a\u5e95+\u221a(S\u4e0a\u5e95\u00b7S\u4e0b\u5e95)+S\u4e0b\u5e95]\u00b7h/3-S\u5e95\u00b7h
=5\u03c0[(4.6²+4.6\u00d76+6²)\u00f73-4²]
\u2248192.38m³
3.14×9.2×4.5+3.14×(9.2/2)²
=129.996+66.4424
≈196.4(平方米)
答:水池表面积约为196.4平方米。
绛旓細9梅2=4.5绫 3.14脳4.5脳4.5脳5=317.925绔嬫柟绫
绛旓細濡傛灉鏄9绫灏辨槸鍦嗙殑鐩村緞锛屽厛绠楀嚭鍦嗙殑妯埅闈㈢Н銆傚厐R2=3.14X(4.5x4.5)=63.585骞虫柟绫砐楂4绫=254.34绔嬫柟绫.
绛旓細1.鍦嗗舰姘存睜鐩村緞9绫筹紝浠栫殑鍛ㄩ暱鏄灏戠背锛岄潰绉槸澶氬皯绫筹紵鍛ㄩ暱锛9X3.14=28.26(绫筹級闈㈢Н锛(9/2)*(9/2)*3.14=63.585锛堝钩鏂圭背锛夌瓟锛氫粬鐨勫懆闀挎槸28.26绫筹紝闈㈢Н鏄63.585骞虫柟绫炽2.涓涓渾鍛ㄩ暱15.7鍘樼背锛屼粬鐨勫崐寰勬槸澶氬皯鍘樼背锛熼潰绉憿锛熷崐寰勶細15.7/3.14/2=2.5锛堝帢绫筹級闈㈢Н锛2.5*2.5*3.1...
绛旓細鍗婂緞锛9梅2=4.5锛堢背锛夊柗姘存睜闈㈢Н锛3.14脳4.5²=63.585锛堝钩鏂圭背锛夊柗姘存睜鍜岀煶瀛愯矾鐨勯潰绉細3.14脳锛4.5+1锛=94.985锛堝钩鏂圭背锛夌煶瀛愯矾鐨勯潰绉細94.985-63.585=31.4锛堝钩鏂圭背锛
绛旓細濡傛灉姹傜殑鏄綋绉殑璇濓紝搴旇鏄珛鏂癸紝浣撶Н绛変簬搴曢潰绉箻浠ラ珮=3.14脳(9.6梅2)²脳3.5=253.2096绔嬫柟绫冲鏋滄眰鐨勬槸琛ㄩ潰绉殑璇濓紝灏辨槸姹傜殑骞虫柟=3.14脳(9.6梅2)²脳2+3.14脳9.6脳3.5=250.1952骞虫柟绫
绛旓細搴曢潰绉=3.14脳(9.9/2)²渚ч潰绉=3.14脳9.9脳3.5 鐒跺悗涓や釜闈㈢Н鍜屽氨鏄钩鏂规暟銆
绛旓細5脳5脳3.14-4.5脳4.5脳3.14=14.9
绛旓細鍗婂緞=鐩村緞/2=9/2=4.5绫 搴曢潰绉=蟺r²=3.14*4.5*4.5=63.585銕 渚ч潰绉=蟺dh=3.14*9*1.83=51.7158銕 琛ㄩ潰绉 =搴曢潰绉+渚ч潰绉 =63.585+51.7158 =115.3008锛堝钩鏂圭背锛
绛旓細1銆佷竴涓鍦嗗舰鍠姘存睜鐨鐩村緞鏄節绫锛屽湪绂绘按姹犺竟0.5绫冲鍥翠笂涓鍦堟爮鏉嗭紝鏍忔潌鍏ㄩ暱澶氬皯绫筹紵鍥存爮鐩村緞=9+0.5脳2=10绫筹紱鍏ㄩ暱=3.14脳10=31.4绫筹紱2銆佷竴涓溅杞殑澶栫洿寰勪负0.96绫筹紝濡傛灉杞﹁疆5鍒嗛挓杞120鍛紝杞﹀瓙姣忓垎閽熷墠杩涘灏戠背锛熸瘡鍒嗛挓鍓嶈繘=3.14脳0.96脳120梅5=72.3456绫 3銆佺敤涓鏍归暱10绫崇殑閾佷笣...
绛旓細鍛ㄩ暱绛変簬鍦嗗懆鐜囦箻浠鐩村緞=3.14脳4.5=14.13绫 鍗婂緞鏄4.5梅2=2.25绫 闈㈢Н=3.14脳2.25脳2.25=15.89625骞虫柟绫