Thursday, November 3, 2011

Area of a Trapezoid

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

This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to

1.) What kind of quadrilateral  is formed when  equals 180 degrees? Justify your answer.
2.) What is the relationship between the area of trapezoid ABCD and the area of the quadrilateral formed in 1?
3.) Using the quadrilateral formed in 1, find the area of the trapezoid. Hint: Use  and .

Download GGB File


  1. Dear friend ,
    I am not getting the plugin .Please tell me where is this .Thanks .

  2. You go to

    and then download Java.