# The areas of two opposite quadrilaterals

## The areas of two opposite quadrilaterals

The applet illustrate the property according to which thesum of the opposite quadrilaterals always equals half the area of the
quadrilateral ABCD, we construct a GeoGebra applet in which one can drag each
of the vertices of the quadrilateral ABCD, and for each location of the
vertices (including a concave quadrilateral), the screen shows the sum of the
areas of the opposite quadrilaterals.

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