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[几何] 外心数量积

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hjfmhh Posted 2018-5-27 22:36 |Read mode

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realnumber Posted 2018-5-27 22:52

两边都与$\vv{AO}$数量积一下，得到半径为2,这样就把OA,OB,OC夹角都算出来了

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