An equilateral or equiangular triangle.
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Every triangle has three sides. If it has any number of sides other than three, then it isn't a triangle.
All triangles have exactly three sides. This is true whether the triangle is equilateral or not. If the triangle is equilateral, then the three sides will all be equal in length.All triangles have three sides.
A shape with three and only three sides is a triangle, but it is not possible for a triangle to have three perpendicular sides.
By definition, a triangle has three sides.