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How many triangles can you make using points on this 5x5 square grid as their vertices?

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How many triangles can you make using points on this 5x5 square grid as their vertices as three possible triangles shown in the following image?

How many triangles

posted May 16 by anonymous
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1 Answer

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If we are to include degenerate triangles there 25C3 = 2300 of them.
If we are to exclude them then 2300 - (50 + 50 + 20 + 20) = 2160.

answer May 16 by Tejas Naik

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