九年级数学---------圆心角与圆周角图地址:http://hi.baidu.com/%D7%B7%CB%DD%C3%CE%CF%EB/album/item/6805ad1f65eb93b2ad513351.htmlP为⊙O上动点,AB⊥CD求证(1)当P在弧CAD上时(不与C、D重合)求证∠CPD与∠COB的关
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![九年级数学---------圆心角与圆周角图地址:http://hi.baidu.com/%D7%B7%CB%DD%C3%CE%CF%EB/album/item/6805ad1f65eb93b2ad513351.htmlP为⊙O上动点,AB⊥CD求证(1)当P在弧CAD上时(不与C、D重合)求证∠CPD与∠COB的关](/uploads/image/z/11957658-42-8.jpg?t=%E4%B9%9D%E5%B9%B4%E7%BA%A7%E6%95%B0%E5%AD%A6---------%E5%9C%86%E5%BF%83%E8%A7%92%E4%B8%8E%E5%9C%86%E5%91%A8%E8%A7%92%E5%9B%BE%E5%9C%B0%E5%9D%80%EF%BC%9Ahttp%3A%2F%2Fhi.baidu.com%2F%25D7%25B7%25CB%25DD%25C3%25CE%25CF%25EB%2Falbum%2Fitem%2F6805ad1f65eb93b2ad513351.htmlP%E4%B8%BA%E2%8A%99O%E4%B8%8A%E5%8A%A8%E7%82%B9%2CAB%E2%8A%A5CD%E6%B1%82%E8%AF%81%EF%BC%881%EF%BC%89%E5%BD%93P%E5%9C%A8%E5%BC%A7CAD%E4%B8%8A%E6%97%B6%EF%BC%88%E4%B8%8D%E4%B8%8EC%E3%80%81D%E9%87%8D%E5%90%88%EF%BC%89%E6%B1%82%E8%AF%81%E2%88%A0CPD%E4%B8%8E%E2%88%A0COB%E7%9A%84%E5%85%B3)
九年级数学---------圆心角与圆周角图地址:http://hi.baidu.com/%D7%B7%CB%DD%C3%CE%CF%EB/album/item/6805ad1f65eb93b2ad513351.htmlP为⊙O上动点,AB⊥CD求证(1)当P在弧CAD上时(不与C、D重合)求证∠CPD与∠COB的关
九年级数学---------圆心角与圆周角
图地址:http://hi.baidu.com/%D7%B7%CB%DD%C3%CE%CF%EB/album/item/6805ad1f65eb93b2ad513351.html
P为⊙O上动点,AB⊥CD求证(1)当P在弧CAD上时(不与C、D重合)求证∠CPD与∠COB的关系?(2)当P在弧CD(劣弧)上时,求∠CP1D与∠COB的关系
∠CP1D不存在,但点P为动点在劣弧上的为P1
九年级数学---------圆心角与圆周角图地址:http://hi.baidu.com/%D7%B7%CB%DD%C3%CE%CF%EB/album/item/6805ad1f65eb93b2ad513351.htmlP为⊙O上动点,AB⊥CD求证(1)当P在弧CAD上时(不与C、D重合)求证∠CPD与∠COB的关
1)∠CPD=∠COB,∵AB⊥CD∴AB平分弧CD∴∠CPD=二分之一弧CD=∠COB
2)连接点P1与点C 点P1与点D,得到圆内接四边形CPDP1
∠CP1DD+∠CPD=180°(圆内接四边形内对角互补)
又∵ ∠COB=∠CPD
∴∠CP1D+∠COB=180°
即∠CP1D 与∠COB 互补
(1)∠CPD=∠COB,∵AB⊥CD∴AB平分弧CD∴∠CPD=二分之一弧CD=∠COB
(2)?什么CP1D,不是这个图啊?