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Let say, I have this figure,

http://s18.postimage.org/4ont0zk9j/Per_Lines.png

I need to get the perpendicular lines (in yellow) length in polygon?

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Do you know all intersection points coordinate? – Aragon Mar 6 '12 at 8:28
Yes. I have all the points of Polygon – abc Mar 6 '12 at 9:26
Got the answer from intmath.com/plane-analytic-geometry/… – abc Mar 6 '12 at 11:35

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The length of the yellow lines is the vertical part of the point coordinate minus the base vertical coordinate.

The units of the length will be in the units of the coordinate system.

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Got the answer from intmath.com/plane-analytic-geometry/… – abc Mar 6 '12 at 11:35

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