![]() ![]() 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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