4-sided polygons include the square, rectangle, and rhombus (all parallelograms), and the trapezoid.
*A fifth type is a concave or convex quadrilateral with no equal or parallel sides.
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Presumably it is simply geometry. However, plane geometry is geometry which is limited to objects with up to two dimensions, that is, objects that lie in a plane - or on a flat surface.
False. The rules and objects of geometry do really match the everyday world.
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True. In geometry it is sometimes helpful to group objects and look at similarities between them.
Yes, the rules and objects of geometry are designed to match the everyday world as much as possible.