That would be a polygon
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Yes. A polygon is by definition a shape enclosed by multiple sides - the smallest number of sides that enclose an area is three.
A plane (flat) shape with three sides is called a "triangle".Notice that if it has three sides, then it must have three angles.
A shape with three sides is called a triangle. A shape with ten sides is called a decagon.
That is called a polygon.
A triangle has three sides.A triangle with three equal sides is called an equilateral triangle.