Counting the Triangles


by Henry E. Dudeney

Home / Puzzle Playground / Puzzles / Visual /

Draw the figure shown on the left; it's a pentagon with each its vertex connected with every other.

The question is how many different triangles are hidden in this figure?

Last Updated: January 21, 2008   |   Posted: June 23, 2001
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Counting the Triangles 2   The Lost Star
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