已知FB,FC分别为角ABD,角DCA的平分线AC BD为直线求角F与角A,角D的等量关系图片:http://hiphotos.baidu.com/%C8%F6%BF%F1%C8%C8/abpic/item/73fe36c9ee395d7cf31fe75a.jpg
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 00:48:30
![已知FB,FC分别为角ABD,角DCA的平分线AC BD为直线求角F与角A,角D的等量关系图片:http://hiphotos.baidu.com/%C8%F6%BF%F1%C8%C8/abpic/item/73fe36c9ee395d7cf31fe75a.jpg](/uploads/image/z/1168267-67-7.jpg?t=%E5%B7%B2%E7%9F%A5FB%2CFC%E5%88%86%E5%88%AB%E4%B8%BA%E8%A7%92ABD%2C%E8%A7%92DCA%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BFAC+BD%E4%B8%BA%E7%9B%B4%E7%BA%BF%E6%B1%82%E8%A7%92F%E4%B8%8E%E8%A7%92A%2C%E8%A7%92D%E7%9A%84%E7%AD%89%E9%87%8F%E5%85%B3%E7%B3%BB%E5%9B%BE%E7%89%87%EF%BC%9Ahttp%3A%2F%2Fhiphotos.baidu.com%2F%25C8%25F6%25BF%25F1%25C8%25C8%2Fabpic%2Fitem%2F73fe36c9ee395d7cf31fe75a.jpg)
已知FB,FC分别为角ABD,角DCA的平分线AC BD为直线求角F与角A,角D的等量关系图片:http://hiphotos.baidu.com/%C8%F6%BF%F1%C8%C8/abpic/item/73fe36c9ee395d7cf31fe75a.jpg
已知FB,FC分别为角ABD,角DCA的平分线
AC BD为直线
求
角F与角A,角D的等量关系
图片:http://hiphotos.baidu.com/%C8%F6%BF%F1%C8%C8/abpic/item/73fe36c9ee395d7cf31fe75a.jpg
已知FB,FC分别为角ABD,角DCA的平分线AC BD为直线求角F与角A,角D的等量关系图片:http://hiphotos.baidu.com/%C8%F6%BF%F1%C8%C8/abpic/item/73fe36c9ee395d7cf31fe75a.jpg
角A+1/2角ABD=角F+1/2角ACD (1)
角D+1/2角ACD=角F+1/2角ABD (2)
(1)式+(2)式得:
角A+1/2角ABD+角D+1/2角ACD=角F+1/2角ACD+角F+1/2角ABD
角A+角D=2角F
角F=1/2(角A+角D)