SOLUTION: An arrangement of dots forms the perimeter of an equilateral triangle. There are 87 evenly spaced dots on each side including the dots at the vertices. How many dots are there alto

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Question 352795: An arrangement of dots forms the perimeter of an equilateral triangle. There are 87 evenly spaced dots on each side including the dots at the vertices. How many dots are there altogether?
Answer by sofiyac(983) About Me  (Show Source):
You can put this solution on YOUR website!
So for first side you have 85 dots and 2 dots as vertices. Triangle only has 3 vertices. So each side is 85 dots but we have 3 sides so 3*85=255 dots, plus 3 vertices.
3%2A85%2B3=258 dots