the ordered relation according to diagonal properties

This article's aim is to suggest a supplementary learning environment to understand the hierarchical classification of quadrilaterals for high school or higher degree learners. Three diagonal properties, being congruent', being perpendicular' and dividing each other in particular ratio,' and all possible combinations of these properties, were used to construct the quadrilaterals in a dynamic geometry environment. According to the diagonal properties, 15 quadrilaterals could be constructed and an order relation was constituted on 16 quadrilaterals including the quadrilateral that did not have any diagonal property. The definition of order relation is any quadrilateral Q(i) is included by another quadrilateral Q(j), if and only if Q(i) has all diagonal properties of Q(j).' According to this relation, an ordered relation diagram was created, and it was found that this relation was not well ordered. After the dynamic geometry construction of each quadrilateral, observations about the diagonal properties of special quadrilaterals were noted. Furthermore, the conditions under which a quadrilateral can be concave are examined. This alternative approach to the construction of quadrilaterals provided an opportunity to define quadrilaterals with more economical and less confusing way than using angle and side properties. For example, a Kite is a quadrilateral whose diagonals are perpendicular and at least one of the diagonals bisects the other' and a Trapezoid is a quadrilateral whose diagonals divide each other in same ratio.