Subcategories of Quadrilaterals

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