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".
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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 hexagon has exactly 6 sides.
Nothing. A triangle is defined as a planar figure constructed with three line segments joined at their ends. A triangle has exactly three sides. Anything else is not a triangle.
A quadrilateral shape has four sides and four internal angles. A triangle has three sides and three internal angles. Therefore there is no such thing as a quadrilateral triangle.
It seems to be called a solid quadrilateral, or a three-sided pyramid. By Nicolas Mackie