Subcategories of Quadrilaterals

Known Coordinates	Squares (5) Diagonals Area and Perimeter	Area and Perimeter	Rectangles (4) Area and Perimeter Diagonals
Known Diagonals	Rhombi (11) Area and Perimeter Diagonals Angle Measures Altitude	1 Known Angle	Parallelograms (11) Area and Perimeter Diagonals Altitude Angle Measures
2 Known Sides and 2 Known...	Trapezoids (13) Area and Perimeter Altitude Diagonals Misc.	2 Known Sides and 1 Known...	Kites (9) Area and Perimeter Angle Measures Diagonals
Diagonals	Cyclic Quadrilaterals (3) Diagonals Angle Measures Area and Perimeter	Known Equations	General (12) Angle Measures Diagonals Area and Perimeter
Finsler-Hadwig Theorem	Misc. Quadrilaterals (1) Finsler-Hadwig Theorem