\u5728\u6570\u5b66\u5b66\u4e60\u4e2d\u9762\u79ef\u95ee\u9898\u4e00\u76f4\u662f\u5b66\u4e60\u7684\u91cd\u70b9\uff0c\u5305\u62ec\u8868\u9762\u79ef\u3001\u5e95\u9762\u79ef\u3001\u4fa7\u9762\u79ef\u7b49\u3002\u4fa7\u9762\u79ef\u662f\u6307\u4e00\u4e2a\u7269\u4f53\u6216\u56fe\u5f62\u7684\u4fa7\u8fb9\u6240\u56f4\u6210\u7684\u9762\u79ef\uff0c\u4fa7\u9762\u79ef\u4e3b\u8981\u662f\u8981\u7acb\u4f53\u56fe\u5f62\uff0c\u50cf\u957f\u65b9\u4f53\uff0c\u6b63\u65b9\u4f53\uff0c\u56ed\u67f1\uff0c\u7403\u7b49\u7acb\u4f53\u56fe\u5f62\u3002\u4f60\u77e5\u9053\u4fa7\u9762\u79ef\u600e\u4e48\u7b97\u5417\uff1f<\/p>\n
\u4fa7\u9762\u79ef\u6307\u7684\u662f\u4ec0\u4e48<\/p>\n
\u4fa7\u9762\u79ef\u662f\u6307\u7acb\u4f53\u56fe\u5f62\u7684\u4fa7\u9762\u5c55\u5f00\u56fe\u7684\u9762\u79ef\uff0c\u533a\u522b\u4e8e\u5e95\u9762\u79ef\uff0c\u7269\u4f53\u7684\u4fa7\u8868\u9762\u6216\u56f4\u6210\u7684\u56fe\u5f62\u8868\u9762\u7684\u5927\u5c0f\uff0c\u53eb\u4f5c\u5b83\u4eec\u7684\u4fa7\u9762\u79ef\uff0c\u6d89\u53ca\u4fa7\u9762\u79ef\u7684\u51e0\u4f55\u56fe\u5f62\u5305\u62ec\u76f4\u67f1\u4f53\u548c\u68f1\u67f1\u3002<\/p>\n
\u4fa7\u9762\u79ef\u7684\u8ba1\u7b97\u65b9\u6cd5\uff1a<\/p>\n
1\u3001\u76f4\u67f1\u4f53\u662f\u4e00\u79cd\u7acb\u4f53\u51e0\u4f55\u56fe\u5f62\uff0c\u6307\u7684\u662f\u67f1\u4f53\u4e0a\u3001\u4e0b\u4e24\u4e2a\u7aef\u9762\u5e73\u884c\uff0c\u4e14\u67f1\u4f53\u7d20\u7ebf\u5782\u76f4\u8fd9\u4e24\u4e2a\u7aef\u9762\u3002\u6bd4\u5982\u5706\u67f1\u3001\u6b63\u68f1\u67f1\u4f53\u3002\u8ba1\u7b97\u76f4\u67f1\u4f53\u4fa7\u9762\u79ef\u7684\u901a\u7528\u516c\u5f0f\u4e3a\uff1aS=Ch\u3002<\/p>\n
2\u3001\u68f1\u67f1\u662f\u7279\u6b8a\u7684\u591a\u9762\u4f53\uff0c\u5206\u4e3a\u76f4\u68f1\u67f1\u548c\u659c\u68f1\u67f1\u3002\u76f4\u68f1\u67f1\u7684\u4fa7\u9762\u79ef\u5b9a\u4e49\u4e3a\uff1a\u523b\u753b\u76f4\u68f1\u67f1\u4fa7\u9762\u5927\u5c0f\u7684\u4e00\u4e2a\u6570\u91cf\u53ca\u5176\u8ba1\u7b97\u516c\u5f0f\uff0c\u76f4\u68f1\u67f1\u5404\u4fa7\u9762\u9762\u79ef\u4e4b\u548c\u79f0\u4e3a\u76f4\u68f1\u67f1\u7684\u4fa7\u9762\u79ef\u3002\u76f4\u68f1\u67f1\u4fa7\u9762\u5c55\u5f00\u56fe\u7684\u9762\u79ef\u5c31\u662f\u5b83\u7684\u4fa7\u9762\u79ef\u3002\u5982\u679c\u76f4\u68f1\u67f1\u7684\u5e95\u9762\u5468\u957f\u662fC\uff0c\u9ad8\u662fh\uff0c\u90a3\u4e48\u5b83\u7684\u4fa7\u9762\u79ef\u662f\uff1aS=Ch\u3002<\/p>\n
\u4fa7\u68f1\u4e0d\u5782\u76f4\u4e8e\u5e95\u9762\u7684\u68f1\u67f1\u53eb\u4f5c\u659c\u68f1\u67f1\uff0c\u659c\u68f1\u67f1\u7684\u4fa7\u9762\u79ef\u7b49\u4e8e\u5b83\u7684\u76f4\u622a\u9762\u7684\u5468\u957f\u4e0e\u4fa7\u68f1\u957f\u7684\u4e58\u79ef\u3002<\/p>\n
\u4f8b\u9898\uff1a<\/p>\n
\u4e00\u4e2an\u68f1\u67f1\u670918\u6761\u68f1\uff0c\u4e00\u6761\u4fa7\u68f1\u957f10cm\uff0c\u5e95\u9762\u6bcf\u6761\u8fb9\u957f\u90fd\u662f5cm\uff0c\u5219\u5b83\u662f\uff08\uff09\u68f1\u67f1\uff0c\u4fa7\u9762\u79ef\u4e3a\uff08\uff09\uff0c\u6240\u6709\u68f1\u957f\u7684\u548c\u4e3a\uff08\uff09\u3002<\/p>\n
\u5206\u6790\uff1a<\/p>\n
\uff081\uff09\u6839\u636e\u68f1\u67f1\u7684\u7279\u70b9\uff0c\u53ef\u752818\u9664\u4ee53\u5373\u53ef\uff1b<\/p>\n
\uff082\uff09\u6839\u636e\u4fa7\u9762\u79ef=\u5e95\u9762\u5468\u957f\u00d7\u9ad8\u53ef\u5f97\u7b54\u6848\uff1b<\/p>\n
\uff083\uff09\u5e95\u9762\u5468\u957f\u00d72+\u9ad8\u00d76\uff0c\u5217\u5f0f\u8ba1\u7b97\u5373\u53ef\u6c42\u89e3\u3002<\/p>\n
\u89e3\uff1a<\/p>\n
\uff081\uff0918\u00f73=6\uff0c\u8fd9\u662f\u4e00\u4e2a\u516d\u68f1\u67f1\uff1b<\/p>\n
\uff082\uff09\u6b64\u68f1\u67f1\u7684\u4fa7\u9762\u79ef\u662f\uff1a5\u00d76\u00d710=300\uff08cm?\uff09\uff1b<\/p>\n
\uff083\uff095\u00d76\u00d72+10\u00d76<\/p>\n
=60+60<\/p>\n
=120\uff08cm\uff09<\/p>\n
\u7b54\uff1a<\/p>\n
\u5b83\u662f\u516d\u68f1\u67f1\uff0c\u4fa7\u9762\u79ef\u4e3a300cm?\uff0c\u6240\u6709\u68f1\u957f\u7684\u548c\u4e3a120cm.<\/p>\n
3\u3001\u5706\u9525\u7684\u4fa7\u9762\u79ef\uff0c\u5706\u9525\u4fa7\u9762\u5c55\u5f00\u56fe\u662f\u4e00\u4e2a\u6247\u5f62\uff0c\u6839\u636e\u6247\u5f62\u7684\u9762\u79ef\u516c\u5f0f\uff1a\u6247\u5f62\u7684\u9762\u79ef\u7b49\u4e8e\u5706\u5fc3\u89d2\uff0c\u5706\u5468\u7387\u4e0e\u6247\u5f62\u7684\u534a\u5f84\u7684\u5e73\u65b9\u7684\u79ef\uff0c\u9664\u4ee5360\u5ea6\uff1b\u5373\u6247\u5f62\u7684\u9762\u79ef\u662f\u5706\u7684\u9762\u79ef\u5206\u6210360\u5206\u4e4b\u540e\uff0c\u5f97\u5230\u5706\u5fc3\u89d2\u7b49\u4e8e1\u5ea6\u7684\u6247\u5f62\u7684\u9762\u79ef\uff0c\u518d\u4e58\u4ee5\u539f\u6247\u5f62\u7684\u5706\u5fc3\u89d2\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u5f97\u5230\u5706\u9525\u4fa7\u9762\u79ef\u6700\u539f\u59cb\u7684\u516c\u5f0f\u3002\u53ea\u8981\u77e5\u9053\u5706\u9525\u4fa7\u9762\u5c55\u5f00\u56fe\u5f97\u5230\u7684\u6247\u5f62\u7684\u5706\u5fc3\u89d2\u4ee5\u53ca\u5706\u9525\u7684\u6bcd\u7ebf\uff0c\u5706\u9525\u7684\u6bcd\u7ebf\u5c31\u662f\u5c55\u5f00\u5f97\u5230\u7684\u6247\u5f62\u7684\u534a\u5f84\uff0c\u5c31\u53ef\u4ee5\u6c42\u5706\u9525\u7684\u4fa7\u9762\u79ef\u4e86\u3002<\/p>\n
\u5706\u9525\u4fa7\u9762\u79ef\u7684\u4e09\u4e2a\u516c\u5f0f\u5206\u522b\u662f\uff1a<\/p>\n
\u5706\u9525\u4fa7\u9762\u79ef=\u5706\u9525\u5e95\u9762\u5468\u957fX\u6bcd\u7ebf\/2\uff0c\u5373S\u4fa7=Cl\/2\uff1b<\/p>\n
\u5706\u9525\u4fa7\u9762\u79ef=\u5706\u9525\u5e95\u9762\u534a\u5f84X\u5706\u5468\u7387X\u6bcd\u7ebf\uff0c\u5373S\u4fa7=\u03c0rl;\uff1b<\/p>\n
\u5706\u9525\u4fa7\u9762\u79ef=\u4fa7\u9762\u5c55\u5f00\u6247\u5f62\u5706\u5fc3\u89d2X\u6bcd\u7ebf\u7684\u5e73\u65b9X\u5706\u5468\u7387\/180\u5ea6\uff0c\u5373S\u4fa7=n\u03c0l^2\/360\u5ea6\u3002<\/p>\n
\u4f8b\u9898\uff1a<\/p>\n
\u4e00\u4e2a\u5706\u9525\u7684\u9ad8\u4e3a3\u221a3\uff0c\u4fa7\u9762\u5c55\u5f00\u56fe\u662f\u534a\u5706\uff0c\u5219\u5706\u9525\u7684\u4fa7\u9762\u79ef\u662f\uff08 \uff09\u3002<\/p>\n
A.9\u03c0 B.18\u03c0 C.27\u03c0 D.39\u03c0<\/p>\n
\u89e3\u6790\uff1a\u8bbe\u5706\u9525\u7684\u5e95\u9762\u534a\u5f84\u4e3ar\uff0c\u6bcd\u7ebf\u957f\u4e3al<\/p>\n
\u7531\u9898\u610f\u5f972\u03c0r=180\u03c0l\/180\uff0c\u2234I=2r<\/p>\n
\u53c8\u2235\u5706\u9525\u7684\u9ad8\u4e3a3\u221a3\uff0c<\/p>\n
\u2234\u6839\u636e\u52fe\u80a1\u5b9a\u7406 l?=r?+3\u221a3<\/p>\n
\u2234l=6\uff0cr=3<\/p>\n
\u2234S\u4fa7\u9762\u79ef=\u03c0rl=\u03c0\u00d73\u00d76=18\u03c0<\/p>\n
\u7b54\u6848\uff1aB<\/p>\n
4\u3001\u5706\u53f0\u7684\u4fa7\u9762\u79ef\uff0c\u5706\u53f0\u4fa7\u9762\u79ef\u7684\u8ba1\u7b97\u516c\u5f0f\u4e3aS=\u03c0l\uff08r1+r2\uff09\uff0c\u5176\u4e2d\uff0cl\u4e3a\u5706\u9525\u6bcd\u7ebf\u7684\u957f\u5ea6\uff0cr1\u548cr2\u5206\u522b\u4e3a\u5706\u53f0\u4e0a\u5e95\u9762\u548c\u4e0b\u5e95\u9762\u7684\u534a\u5f84\u3002<\/p>\n
\u8fd9\u662f\u56e0\u4e3a\u5706\u53f0\u7684\u4fa7\u9762\u53ef\u4ee5\u5c55\u5f00\u6210\u4e00\u4e2a\u68af\u5f62\uff0c\u800c\u68af\u5f62\u7684\u9762\u79ef\u53ef\u4ee5\u7528\u516c\u5f0fS=\uff08a+b\uff09h\/2\u6765\u8ba1\u7b97\uff0c\u5176\u4e2da\u548cb\u5206\u522b\u4e3a\u68af\u5f62\u7684\u4e0a\u5e95\u548c\u4e0b\u5e95\u7684\u957f\u5ea6\uff0ch\u4e3a\u68af\u5f62\u7684\u9ad8\u3002<\/p>\n
\u5c06\u5706\u53f0\u5c55\u5f00\u540e\uff0c\u53ef\u4ee5\u53d1\u73b0\u68af\u5f62\u7684\u4e0a\u5e95\u548c\u4e0b\u5e95\u5206\u522b\u4e3a\u5706\u53f0\u4e0a\u5e95\u9762\u548c\u4e0b\u5e95\u9762\u7684\u5468\u957f\uff0c\u53732\u03c0r1\u548c2\u03c0r2\uff0c\u800c\u68af\u5f62\u7684\u9ad8\u5219\u4e3a\u5706\u9525\u6bcd\u7ebf\u7684\u957f\u5ea6l\uff0c\u4ee3\u5165\u516c\u5f0fS=\uff08a+b\uff09h\/2\u4e2d\u5f97\u5230S=\u03c0l\uff08r1+r2\uff09\u3002<\/p>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8ba1\u7b97\u5706\u53f0\u4fa7\u9762\u79ef\u65f6\u8981\u5148\u786e\u5b9a\u5706\u53f0\u7684\u9ad8\u548c\u5e95\u9762\u534a\u5f84\uff0c\u7136\u540e\u518d\u5e26\u5165\u516c\u5f0f\u8ba1\u7b97\u3002<\/p>\n
\u63a8\u5bfc\u8fc7\u7a0b\uff1a<\/p>\n
\u8bbe\u5706\u53f0\u7684\u4e0a\u4e0b\u5e95\u9762\u534a\u5f84\u5206\u522b\u4e3ar\u2018\uff0cr\uff0c\u6bcd\u7ebf\u957f\u4e3a1\u3002<\/p>\n
\u5219\u5176\u4fa7\u9762\u5c55\u5f00\u56fe\u662f\u4e00\u4e2a\u6247\u73af\uff0c\u5c0f\u6247\u5f62\u7684\u5f27\u957f\u4e3a2\u03c0r\u2019\uff0c\u5927\u6247\u5f62\u7684\u5f27\u957f\u4e3a2\u03c0r\u3002<\/p>\n
\u8bbe\u5c0f\u6247\u5f62\u7684\u534a\u5f84\u4e3ax\uff0c\u5219\u5927\u6247\u5f62\u7684\u534a\u5f84\u4e3ax+l\uff0c\u5219x\/\uff08x+l\uff09=r’\/r\uff0crx=r\u2018\uff08x+1\uff09\u3002<\/p>\n
\u6240\u4ee5\uff1a<\/p>\n
S\u5706\u53f0\u4fa7=S\u5927\u6247\u5f62-S\u5c0f\u6247\u5f62=\u03c0r\uff08x+l\uff09-\u03c0r’x=\u03c0rx+\u03c0r|-\u03c0r’x=\u03c0r\u2019\uff08x+|\uff09+\u03c0r|-\u03c0r’x=\u03c0\uff08r+r\u2018\uff09l\u3002<\/p>\n
\u4f8b\u9898\uff1a<\/p>\n
\u5706\u9525\u4f53\u88ab\u6c34\u5e73\u7684\u5e73\u9762\u5207\u5272\u3002 \u622a\u9525\u4f53\u5706\u9876\u534a\u5f8410m\uff0c\u5706\u5e95\u534a\u5f843m\u3002 \u622a\u9525\u4f53\u9ad8\u5ea6\u4e3a24\u7c73\u3002 \u5982\u679c\u5706\u53f0\u9ad8\u5ea6\u4e3a24m\uff0c\u5219\u6c42\u5706\u53f0\u7684\u4fa7\u8868\u9762\u79ef\u3002<\/p>\n
\u89e3\uff1a<\/p>\n
\u534a\u5f84\u4e3ar1 = 10m, r? = 3m<\/p>\n
\u9ad8\u5ea6\uff0cH = 24m<\/p>\n
\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u627e\u5230\u622a\u9525\u4f53\u7684\u6bcd\u7ebf\u957fl\uff0c\u901a\u8fc7\u516c\u5f0f\uff1a<\/p>\n
L =\u221a[ + ]<\/p>\n
=\u221a\uff0849 + 576\uff09<\/p>\n
=\u221a625<\/p>\n
= 25\u7c73<\/p>\n
\u5706\u53f0\u7684\u4fa7\u9762= \u03c0\uff08r1 + r?\uff09l<\/p>\n
LSA =\u03c0\uff0810 + 3\uff0925<\/p>\n
= 325\u03c0\u5e73\u65b9\u7c73\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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