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#4 2012-01-19 01:40:48
- jji7skyline
- Scratcher
- Registered: 2010-03-08
- Posts: 1000+
Re: Proof Help
Um... I think so 
A triangle with the angles marked means that all angles in a triangle add up to 180°. Is that the kind you mean?
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#6 2012-01-19 01:54:34
- jji7skyline
- Scratcher
- Registered: 2010-03-08
- Posts: 1000+
Re: Proof Help
JJROCKER wrote:
jji7skyline wrote:
Um... I think so
A triangle with the angles marked means that all angles in a triangle add up to 180°. Is that the kind you mean?Uhhh like a two column proof.
Uhhh... I have no idea what you mean
I don't know why you say goodbye, I say hello!
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#7 2012-01-19 08:47:43
- demosthenes
- Retired Community Moderator
- Registered: 2008-02-19
- Posts: 1000+
Re: Proof Help
JJROCKER wrote:
How about where they give you four points on a line heading in a downward position in the order DOWN and they give you the following information...
Given: DW = ON
Prove: DO= WN
I think this is the problem in question
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D
|
O
|
W
|
N
We have DW = DO + OW and ON = OW + WN
We subtract the equations: DW - ON = DO - WN
By given, DW = ON and thus DW - ON = 0, this means DO - WN = 0, which means DO = WN. QED.
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#8 2012-01-19 09:33:16
- veggieman001
- Scratcher
- Registered: 2010-02-20
- Posts: 1000+
Re: Proof Help
demosthenes wrote:
JJROCKER wrote:
How about where they give you four points on a line heading in a downward position in the order DOWN and they give you the following information...
Given: DW = ON
Prove: DO= WNI think this is the problem in question
|
D
|
O
|
W
|
N
We have DW = DO + OW and ON = OW + WN
We subtract the equations: DW - ON = DO - WN
By given, DW = ON and thus DW - ON = 0, this means DO - WN = 0, which means DO = WN. QED.
Exactly what I was thinking 
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#9 2012-01-19 09:57:57
Re: Proof Help
demosthenes wrote:
JJROCKER wrote:
How about where they give you four points on a line heading in a downward position in the order DOWN and they give you the following information...
Given: DW = ON
Prove: DO= WNI think this is the problem in question
|
D
|
O
|
W
|
N
We have DW = DO + OW and ON = OW + WN
We subtract the equations: DW - ON = DO - WN
By given, DW = ON and thus DW - ON = 0, this means DO - WN = 0, which means DO = WN. QED.
Oh, I see! Thanks
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