直径是一米、那么45斜长是多少米？ 直径为1米，周长等于多少？
\u76f4\u5f8411\u7c73 \u5e95\u3002\u4e0a\u76f4\u5f841\u7c73 \u5761\u5ea6\u957f4.85\u7c73\uff0c\u90a3\u4e48\u8fd9\u4e2a\u767d\u8272\u7684\u9762\u79ef\u662f\u591a\u5c11\u5c55\u5f00\u5e94\u8be5\u662f\u4e00\u4e2a\u6247\u5f62\uff0c\u8bbe\u6247\u5f62\u7684\u5185\u5916\u534a\u5f84\u5206\u522b\u4e3ar\u548cR\uff0c\u6247\u5f62\u7684\u89d2\u5ea6\u4e3a\u03b8\uff08\u5f27\u5ea6\uff09\u3002
\u4e8e\u662f\uff1a\u03b8R=11\u00d7\u03c0
\u03b8r=1\u00d7\u03c0
\u4e24\u8fb9\u76f8\u9664\uff0c\u5f97\uff1a
R/r=11
\u800cR-r=4.85
\u89e3\u51fa\uff1ar=0.485
R=5.335
\u03b8=6.47
\u659c\u9762\u7684\u9762\u79efS
=\u03b8/(2\u03c0\uff09\u00d7\u03c0\uff08R²-r²\uff09
=6.47/2\u00d7\uff085.335²-0.485²\uff09
=91.314
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\u77e5\u9053\u4e86\u5706\u5f62\u7684\u76f4\u5f84\u600e\u4e48\u7b97\u5468\u957f
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绛旓細瑙8.7涓7.25=1.45锛1.45梅14=0.10357 tg伪=0.10357 .<伪=5.913搴︺鏂滈暱=鈭(0.45^2+14^2)=14.0749 鍧″害涓0.10357锛岃搴︿负5.913搴︼紝閽暱绾14.075绫炽
