square equilateral rhombus equilateral rectangle, trapezoid, etc...
When manipulating the square in GSP, the size and position of the square could be changed but nothing else. The interior angles remained 90 degrees each and the sides remained all equal lengths. Also, opposite sides remained parallel to eachother.
Therefore, all other quadrilaterals
could be formed from a square but only in special cases. The
special cases must have the following 3 traits:
1.
Equal sides
2. Interior angles that equal 90 degrees
3. Opposite sides are parallel
For example, a rectangle is a special case of a square
if it satisifies the above three traits. However, if one set of parallel
sides were longer than the other set, the rectangle would no longer be
a special case of a square.