![]() ![]() The square is also the name of the regular quadrilateral - one in which all sides are congruent and all angles are congruent. squares ( B), the most special of them all and sometimes.Elementary school typically has children learn the names of The names of many of these special quadrilaterals are also typically part of the elementary curriculum, though little else about the properties of these figures may be studied until high school. The classification schemes taught in elementary school involve the number of pairs of parallel sides, and the congruence of sides, and whether or not all the angles are right angles (all angles are congruent). ![]() Quadrilaterals can be classified by whether or not their sides, angles, diagonals, or vertices have special properties. Like all polygons that have more than three sides, quadrilaterals can be convex like these, ,, or concave like these. Just as triangles and quadrilaterals are special types of polygons, there are many subclasses of quadrilaterals. Lateral means “side” (think of football, for example). Quadri- (four) + -lateral (side) means “four-sided.”Ĭompare quadri- to Spanish cuatro.
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