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#1 2012-09-07 08:44:11
- zee-f
- Super Member
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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
#2 2012-09-07 08:47:37
- bobbym
- Administrator
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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.
Probability is the most important concept in modern science, especially as nobody has the slightest notion what it means.
90% of mathematicians do not understand 90% of currently published mathematics.
#4 2012-09-07 09:00:37
- bobbym
- Administrator
Online
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.
Probability is the most important concept in modern science, especially as nobody has the slightest notion what it means.
90% of mathematicians do not understand 90% of currently published mathematics.