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David uses some coins to form a triangle. There is a coin at every corner. How many coins does he use if there are 6 coins on each side of the triangle?

 Apr 7, 2021
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David uses some coins to form a triangle. There is a coin at every corner. How many coins does he use if there are 6 coins on each side of the triangle?   

 

Draw it and count them.  I don't know if you mean a solid triangle or just the outline. 

If you mean just the outline, you could get yourself 15 coins and make a model.   :D 

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 Apr 7, 2021

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