As follows:
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maths~~~~~
2009-11-01 7:28 am
回答 (2)
2009-11-01 11:20 pm
✔ 最佳答案
Ⅰ : ㄥCOE + ㄥHOF = 180 - ㄥCOH
= 180 - (x + ㄥAOH)
= 180 - (x + y)
= 180 - 90
= 90
Ⅰ is true.
By Ⅰ , ㄥCOH = 90 that means CD丄GH.
Ⅱ is true.
ㄥDOF
= ㄥBOF - ㄥBOD
= 90 - ㄥBOD
= [ㄥGOD=90 since (CD丄GH) ] - ㄥBOD
= y
=ㄥBOG
Ⅲ is true.
2009-11-01 7:48 am
1同2
COE+HOF
=(90-x)+(90-y)
=90-x+90-y
=180-x-y
=180-(x+y)
=180-90
=90
所以1correct
BOD=x(對頂角vert. opp. angles)
GOD=x+y
=90
所以2correct
COE+HOF
=(90-x)+(90-y)
=90-x+90-y
=180-x-y
=180-(x+y)
=180-90
=90
所以1correct
BOD=x(對頂角vert. opp. angles)
GOD=x+y
=90
所以2correct
參考: me
收錄日期: 2021-04-21 22:06:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091031000051KK01895