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九年级数学《圆》 知识点总结

  • 2026-11-06 14:10:20
九年级数学《圆》 知识点总结
圆的章节已经学完了，请大家根据知识梳理再复习一下吧！
知识梳理中缺少两个知识点：圆内接三角形和圆内接四边形的性质。
外接圆的圆心是三角形三边垂直平分线的交点。
圆内接四边形对角互补。
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

嘉祥、七中…成都初三期中真题+解析汇总

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000644s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000944s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000468s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000373s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000569s ]
  6. SELECT * FROM `set` [ RunTime:0.000276s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000538s ]
  8. SELECT * FROM `article` WHERE `id` = 538921 LIMIT 1 [ RunTime:0.000346s ]
  9. UPDATE `article` SET `lasttime` = 1793995343 WHERE `id` = 538921 [ RunTime:0.001237s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000334s ]
  11. SELECT * FROM `article` WHERE `id` < 538921 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000405s ]
  12. SELECT * FROM `article` WHERE `id` > 538921 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000366s ]
  13. SELECT * FROM `article` WHERE `id` < 538921 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000660s ]
  14. SELECT * FROM `article` WHERE `id` < 538921 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000693s ]
  15. SELECT * FROM `article` WHERE `id` < 538921 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000625s ]
0.085407s