Geometry -How do you find the length of collinear points in a diagram?

My teacher is terrible at explaining things.

?2012-10-01T15:50:15Z

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Depends on the question and what details are given... Mail me any example n I'll answer you

Anonymous2012-10-01T15:53:44Z

points have no length and any two

p1=(x1,y1) , p2=(x2,y2)

are colinear along the line

r(t) = p1+ (p2-p1)*t = (x1 +(x2-x1)*t ,y1 +(y2-y1)*t )


distance between two points p1=(x1,y1) , p2=(x2,y2) is
d = ( (x1-x2)^2 +(y1-y2)^2)^1/2