Trapezoids and Diagonals

Explore the different trapezoids you can make by changing points B and D and changing the slider. Points R and S are the midpoints on diagonals AC and BD, respectively. What do you notice about the line containing points R and S?

Try to write a vector in the input command that describes the vector from R to S using only A, B, C, and D.

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This applet comes from extra problem #1 of the review for the midterm.

Jillian Maher, July 10, 2008, Created with GeoGebra