# Changes

/* Classification of Quadrilaterals */

* A [[rhombus]] has four equal sides

* A [[kite]] has two pairs of adjacent equal sides

* A [[re-entrant quadrilateral]] has one internal angle greater than 180<sup>0</sup>; this may be contrasted with a [[convex quadrilateral]] in which all internal angles are less than 180<sup>0</sup>

* An [[arrowhead]] is a re-entrant [[kite]]

* A [[square]] is both a [[rectangle]] and a [[rhombus]]