Street Science
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Street Science

How To Really Solve The Straight Lines And Triangles Puzzle?

A simple puzzle whose applications go beyond geometry!

How To Really Solve The Straight Lines And Triangles Puzzle? — An image showing four straight lines that intersect each other at a unique point. At any point of intersection, no more than two lines are involved. On top of this illustration, the following question is posed: “HOW MANY TRIANGLES?”
Illustration created by the author

The straight lines and triangles puzzle follows directly from my essay on the quadratic equation magic trick. In this puzzle, your job is to figure out how many triangles you can construct using ’n’ straight lines.

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