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polygons are two-dimensional figures that can be classified based on properties such as the number of sides and the number of angles. based on this description of polygons, which statement correctly describes relationships of polygons?

a) triangles are not polygons.
b) triangles and quadrilaterals are polygons, and parallelograms and rectangles are types of quadrilaterals.
c) squares, triangles, and rectangles are all polygons, while rhombus and equilateral are types of triangles.
d) polygons and triangles are types of quadrilaterals, while right, isosceles, and scalene are types of triangles.