1. B and C and you form a box whose sides are all parallelograms.

2. It is the envelope of a series of parallelograms of equal area and sharing two sides.

3. Hypotheses also suggest that people exposed to Carpentered environments interpret parallelograms drawn two-dimensionally as three-dimensional objects.

4. ‘The reason is that one can divide the larger square into nine Congruent copies of the smaller one’ ‘Each vertex triangle in the new hexagon is either Congruent to one in the original hexagon or has the same base and height.’ ‘Four Congruent sides lie on two parallel lines, and pairs of these sides define parallelograms of equal area.’