3*10 = 30 sides.
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There are ten sides in a decagon and three sides in a triangle. So in 3 decagons and 5 triangles there are 3*10 + 5*3 = 30 + 15 = 45 sides altogether.
3 because equilateral triangles are triangles that have 3 congruent sides.
9
all triangles have three sides
all triangles have three sides