The bisectors of two adjacnt supplemntary angles form a right angle.
Given: <ABC is supp. to < CBD
BE bisects <CBD
BF bisects <CBD
Prove: <EBF is a right angle
下面係題目圖片
http://imageshack.us/photo/my-images/856/114vsv.jpg/
希望解答者能打出statement和reason
求解中學幾何數學題
2012-06-25 6:30 pm
回答 (1)
2012-06-25 7:00 pm
✔ 最佳答案
ABC + CBD = 180 (adj. <s on st. line)ABE + EBC + CBF + FBD = 180
EBC + EBC + CBF + CBF = 180
2EBC + 2CBF = 180
2(EBC + CBF) = 180
2EBF = 180
EBF = 90
thus, EBF is a right angle
參考: knowledge
收錄日期: 2021-04-13 19:23:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120625000051KK00129