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Thursday, January 17, 2008

Star Spangled Triangles

There are ten unique triangles in the figure below. The points, A, B, D, E, and F are obvious. You can also make triangles using opposing points along with the center pentagon; the combinations ACE, ACF, BCD, BCF, and DCE also are triangles.

Can you draw one line through the star to end up with more than 15 unique triangles?

Posted by Erik at 5:16 AM
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1 comments:

Anonymous said...

What's the answer? I tried several different ways and my line is not one straigt line. It comes to a point and then goes another direction without lifting my pencil. Is this correct?

April 28, 2009 8:48:00 AM PDT

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