Quad Midpoints Action!
In the applet below, a quadrilateral is shown.
You can move the vertices of this quadrilateral wherever you'd like.
Interact with this applet for a few minutes to identify any patterns/relationships you
notice among the parts (sides, angles, diagonals, midpoints, etc.) of a quadrilateral.
Be sure to change the locations of the quadrilateral's vertices each time before and after re-sliding the slider!