Subcategories of Quadrilaterals

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