Equilateral --> 3 equal sides
Isosceles --> 2 equal sides only
Scalene --> 3 unique sides
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All triangles have exactly three sides. If the number of sides were anything other than three there would not be a triangle - of any kind.
No. Triangles all have three sides.
Some triangles are equilateral, but not all of them. There are three types of triangles. Triangles which have three equal sides and three equal angles are called equilateral triangles. Isosceles triangles have two equal sides and two equal angles. Scalene triangles have no equal sides and no equal angles.
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
Equilateral triangles have three congruent sides and three congruent angles