equilateral triangle
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An internal angle of the polygon.
A rhombus
A polygon is pretty much any enclosed shape constructed of straight line segments connected end to end. The angles do not have to be right. In fact, they usually aren't. A right angle would NEVER be a polygon, as it is just one right angle. In Euclidean geometry a right angle must be accompanied by two acute angles to form a triangle--the polygon with the smallest number of sides.
Any polygon can have a right angle. A right angled triangle is an example.
no polygon can have its angle sum be 1660 degrees. the closest shape would be a 11 sides shape