王阿姨做了一个圆柱形的抱枕，长80厘米，底面直径18厘米。如果侧面用花布，底面用黄色的布，两种布各 王阿姨做了一个圆柱形的抱枕，长80厘米，底面直径18厘米，如...
\u738b\u963f\u59e8\u505a\u4e86\u4e00\u4e2a\u5706\u67f1\u5f62\u7684\u62b1\u6795\uff0c\u957f80cm\uff0c\u5e95\u9762\u76f4\u5f8418cm\uff0c\u5982\u679c\u4fa7\u9762\u7528\u82b1\u5e03\uff0c\u5e95\u9762\u7528\u9ec4\u8272\u7684\u5e03\uff0c\u4e24\u79cd\u5e03\u5404\u601d\u8003\uff1a\u8fd9\u662f\u4e2a\u5706\u67f1\u5f62\uff0c\u957f80cm\uff0c\u76f4\u5f8418cm\uff0c\u6c42\u4fa7\u9762\u79ef\uff08\u82b1\u5e03\uff09\u591a\u5c11\uff1f \u4e24\u7aef\u9762\u79ef\uff08\u9ec4\u5e03\uff09\u4e4b\u548c\u591a\u5c11\uff1f
\u5148\u6c42\u82b1\u5e03\u9762\u79ef\uff0c\u5c55\u5f00\u5706\u67f1\u4f53\u7684\u8868\u9762\uff0c\u5c31\u662f\u4e00\u4e2a\u957f\u65b9\u5f62\uff0c\u957f80cm\uff0c\u5bbd\u7b49\u4e8e\u5706\u67f1\u4f53\u5468\u957f\uff0c\u537318cm*3.1415926
\u5217\u5f0f\uff1a80*18*3.1415926=4523.893344\u5e73\u65b9\u5398\u7c73
\u518d\u6c42\u9ec4\u5e03\u9762\u79ef\uff0c\u6709\u4e24\u4e2a\u7aef\u9762\uff0c\u6240\u4ee5\u9ec4\u5e03\u9762\u79ef\u662f\u5730\u9762\u79ef\u76842\u500d
\u5217\u5f0f\uff1a18/2*18/2*3.1415926*2
=9*9*3.1415926*2
=508.938\u5e73\u65b9\u5398\u7c73
\u7b54\uff1a\u9700\u82b1\u5e034523.893344\u5e73\u65b9\u5398\u7c73\uff0c\u9700\u9ec4\u5e03508.938\u5e73\u65b9\u5398\u7c73\u3002
\u82b1\u5e031440\u220f \u339d²
\u9ec4\u5e0381\u220f \u339d²
=36π×80cm³
底面积×2=18²π×2=648πcm³
绛旓細鑺卞竷鐢ㄥ竷 =渚ч潰绉 =3.14脳18脳80 =4521.6骞虫柟鍘樼背 榛勫竷鐢ㄥ竷 =搴曢潰绉2 =3.14脳锛18梅2锛²脳2 =508.68骞虫柟鍘樼背
绛旓細瑙ｏ細渚ч潰绉細3.14脳18脳80=4521.6锛堝钩鏂瑰帢绫筹級涓や釜搴曢潰绉細3.14脳锛18梅2锛²脳2 =3.14脳81脳2 =508.68锛堝钩鏂瑰帢绫筹級绛旓細渚ч潰鐢ㄨ姳甯冮渶瑕4521.6骞虫柟鍘樼背锛屽簳闈㈢敤榛勫竷闇瑕508.68骞虫柟鍘樼背锛
绛旓細瑙ｏ細鑺卞竷锛3.14脳18脳80锛4 521.6(cm )锛岄粍甯冿細3.14脳(18梅2) 脳2锛508.68(cm ).鏁呯瓟妗堜负锛氳姳甯冿細4 521.6 cm 榛勫竷锛508.68 cm
绛旓細搴曢潰鍗婂緞锛18梅2=9锛堝帢绫筹級闇瑕侀粍甯冿細9²脳3.14脳2=508.68锛堝钩鏂瑰帢绫筹級闇瑕佽姳甯冿細18脳3.14脳80=4521.6锛堝钩鏂瑰帢绫筹級
绛旓細闀80cm锛屽绛変簬鍦嗘煴浣撳懆闀匡紝鍗18cm*3.1415926 鍒楀紡锛80*18*3.1415926=4523.893344骞虫柟鍘樼背 鍐嶆眰榛勫竷闈㈢Н锛屾湁涓や釜绔潰锛屾墍浠ラ粍甯冮潰绉槸鍦伴潰绉殑2鍊 鍒楀紡锛18/2*18/2*3.1415926*2 =9*9*3.1415926*2 =508.938骞虫柟鍘樼背 绛旓細闇鑺卞竷4523.893344骞虫柟鍘樼背锛岄渶榛勫竷508.938骞虫柟鍘樼背銆
绛旓細渚ч潰绉細2蟺rh=2脳3.14脳9脳80=4521.6 骞虫柟鍘樼背 鑺卞竷瑕佺敤4521.6 骞虫柟鍘樼背 搴曢潰绉細2蟺r²=2脳3.14脳81=508.68骞虫柟鍘樼背 榛勫竷瑕佺敤508.68骞虫柟鍘樼背
绛旓細r=18/2=9 搴曢潰绉=3.14*9*9*2=508.68 渚ч潰绉=3.14*18*80=4521.6
绛旓細鑺卞竷瑕288蟺銕濈殑骞虫柟锛岄粍甯冭162蟺銕濈殑骞虫柟銆
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
绛旓細鐩村緞18cm 鍗婂緞r=18梅2=9cm 搴曢潰绉疭=蟺r²=3.14x9x9=254.34骞虫柟鍘樼背 搴曢潰鐢ㄩ粍鑹茬殑甯冧负2x254.34=508.68骞虫柟鍘樼背 鐩村緞涓3.14x18=56.52鍘樼背 渚ч潰鐢ㄨ姳甯80x56.52=4521.6骞虫柟鍘樼背
