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
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Triangles are equilateral triangles only when all of their 3 sides are equal in lengths.
All triangles have 3 sides.
All triangles have exactly 3 sides. That is what the word triangle means, a geometrical figure having 3 angles and 3 sides. Always 3.
All triangles have 3 sides but an isosceles triangle has 2 equal sides and an equilateral triangle has 3 equal sides.