# SOLUTION: "What is the number of triangles formed in a decagon when all the diagonals from one vertex are drawn?" What does this mean and how do I figure it out?

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 Question 260429: "What is the number of triangles formed in a decagon when all the diagonals from one vertex are drawn?" What does this mean and how do I figure it out? Answer by stanbon(57384)   (Show Source): You can put this solution on YOUR website!"What is the number of triangles formed in a decagon when all the diagonals from one vertex are drawn?" What does this mean and how do I figure it out? --------------------------------------------- look for a pattern: 4 sides (square): # of tiangles = 2 5 sides (pentagon): # of triangles = 3 6 sides (sexagon); # of triangles = 4 ---- --- 10 sides (decagon: # of triangles = ? ======================================== Cheers, stan H.