Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
#1 2012-09-06 10:44:11
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
lines
I am really having trouble answering this question 
If I have two lines, will they cross? Explain fully. What postulate helps me answer this question?
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#2 2012-09-06 10:47:37
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: lines
On a plane. They can be parallel and never meet. They can intersect at 1 point. They can be the same line ( on top of each other ) and intersect at an infinite number of points.
Parallel postulate talks about parallel lines never crossing.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#3 2012-09-06 10:54:27
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
Re: lines
So they can and cant? depending on the point or direction ?
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#4 2012-09-06 11:00:37
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: lines
Yes, those are the three possibilites, provided both lines are on a plane.
In the drawing below I have shortened the lines so they look like segments to beter fit them on a screen. Remember as lines they continue on forever.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline