Move point A to change the shape of the trapezoid. Then move the slider the extreme right to rotate the trapezoid.

1.) What kind of quadrilateral is formed when [math] \alpha [/math] equals 180 degrees? Justify your answer.[br]2.) What is the relationship between the area of trapezoid ABCD and the area of the quadrilateral formed in 1? [br]3.) Using the quadrilateral formed in 1, find the area of the trapezoid. Hint: Use the [math]b_1[/math], [math]b_2[/math], and [math]h[/math].[br][br]More than [url=http://mathandmultimedia.com/geogebra/]50 GeoGebra Tutorials[/url] at [url=http://mathandmultimedia.com/]Math and Multimedia [/url]