# Dynamic trapezoid

A trapezoid is a 4-sided plane figure with a pair of parallel sides. (Note that this doesn't exclude having

*two*pairs of parallel sides.) Move B to change the length of the first base. Move C to change the length of the second base. Move D to change the position of the second base. Move E to change the height. To gradually change a point, select the point and hold down an arrow key.Can you make

- a parallelogram?
- a rhombus?
- a rectangle?
- a square?

*Measuring the World: Mathematics for Elementary and Middle School Teachers*by Susan Addington and David Dennis. Copyright 2009.## New Resources

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