Not normally because the left hand side is equal to the right hand side of an equation
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A shape with three and only three sides is a triangle, but it is not possible for a triangle to have three perpendicular sides.
Every triangle has three sides. If it has any number of sides other than three, then it isn't a triangle.
Polynomials have terms, but not sides. One with exactly three terms is a "trinomial". Polygons have sides. One of those with exactly three sides is 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 polygon can have any number of sides above three. The name of a three-sided polygon is a triangle.