This page uses JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright © 1990-2001 by KCP Technologies, Inc. Licensed only for non-commercial use.
ABCD is a quadrilateral.
E, F, G and H are midpoints of the sides of ABCD. Drag A, B, C or D to check this.
Compare lengths of EF, FG, GH and HE given at top left.
What shape is EFGH? Are you sure? Why?