Counting the Triangles


by Henry E. Dudeney

Home / Puzzles in Education / Hands On Puzzles / Grade 7-8 /

Draw the figure shown in the illustration; it's a pentagon with each its vertex connected with every other. The question is how many different triangles are hidden in this figure?

Posted: December 11, 2007
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Building Polygons Counting the Triangles 2
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