Quadrilateral Coil, 2 February 1997
In this JavaSketch, congruent quadrilaterals are joined edge to edge. You can vary the shape of the quadrilaterals by dragging the vertices at the yellow quadrilateral.
- What series of quadrilaterals create a straight line?
- What must be true of the quadrilaterals in order for a "coil" of them to close perfectly upon itself?
If you drag the coil into oblivion, you can reset the JavaSketch to its original shape by pressing the up-arrow key.