Any shapes that have 4 sides are quadrilaterals
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No, and all parrallelograms are not quadralaterals.
no, but all parallelograms are quadralaterals.
Have a look at the picture I put into this other answer. It will show you the 7 quadralaterals. http://wiki.answers.com/Q/What_is_a_quadrilateral_where_each_angle_is_right_angle
There are infinitely many such shapes. There are infinitely many such shapes. There are infinitely many such shapes. There are infinitely many such shapes.
Organic shapes are shapes with a natural look and a flowing and curving appearance.