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    20．如图.为外接圆的直径..垂足为点.的平分线交于点.连接.. (1) 求证:, (2) 请判断..三点是否在以为圆心.以为半径的圆上?并说明理由. (1)证明:∵为直径.. ∴.∴. ································································· 3分 (2)答:..三点在以为圆心.以为半径的圆上. ···························· 4分 理由:由(1)知:.∴. ∵... ∴.∴.··································································· 6分 由(1)知:.∴. ∴..三点在以为圆心.以为半径的圆上. 【查看更多】

     

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