Construct Quadrilaterals with Special Constraints

A quadrilateral is a polygon with four sides. It is much more complicated than a triangle. However, you can explore dynamic quadrilaterals the same ways you explored dynamic triangles. You can construct dynamic quadrilaterals the same ways you constructed dynamic triangles.[br][br]Chat about the constraints that have been constructed into these quadrilaterals.[br]Can you figure out how they were constructed? Try to construct them and test them by dragging.
Construct Quadrilaterals with Special Constraints

Information: Construct Quadrilaterals with Special Constraints