Posted by Katherine on Monday, March 22, 2010 at 5:57pm.
A segment is created by joining any two points
So the question comes down to how many pairs of points can I form from 5 points.
This is a combination question
it would be 5choose 2 or C(5,2) = 10
Or
you could set up a pattern
points - lines
2 1
3 3 , an increase of 2
4 6 , an increase of 3
5 10 , and increase of 4 !!!! aha, there is the pattern
6 15 etc
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