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triangles all have three sides because the stem tri means 3 and its angle means sides so it has three angles which equals three sides
A nonagon has nine sides, and a triangle has three, so altogether they have 12 sides.
You have described an equilateral triangle.
Prefix tri means three so a tricycle has three wheels or a triangle has three sides.
Because the sum of the sides of three triangles is nine... Placing three triangles together so they all touch effectively removes four of the total number of sides - leaving five.