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excel - how to connect a graph max with original (0,0) point

If I have a spreadsheet that has the following data: A 0 0 1 2 2 4 3 4 4 6 0-4 X Axis A is Y Axis First point is (0,0) Second Point is (1,2) Third point is (2,4) ...
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Is there a graph paper like drawing software?

I have a college assignment, where I have to draw diagrams of voronoi, delaunay, minimum spanning tree etc for the college. I want to do that in computer. I searched in google with no luck. Is there ...