Definition:Quadrilateral/Dart

Definition
A dart is an irregular quadrilateral with a reflex angle.


 * Darts.png

Also defined as
Some sources prefer to reserve the term dart for a reflex-angled trapezium which has both pairs of adjacent sides equal, for example $EFGH$ in the diagram above.

Other uses restrict the term specifically to the dart in the Penrose tiles.

Also known as
A dart whose adjacent sides are equal is also called a deltoid.

Also see

 * Definition:Kite