Relations
- broader:
- (en) Polygon
- narrower:
- (en) Arrowhead
- (en) Aubel's theorem
- (en) Cyclic quadrilateral
- (en) Diamond
- (en) Parallelogram
- (en) Quadrilateral with equal and orthogonal diagonals
- (en) Quadrilateral with equal diagonals
- (en) Quadrilateral with orthogonal diagonals
- (en) Rectangle
- (en) Rhombus
- (en) Square
- (en) Trapezium or trapezoid
- references:
- (en) Four
- referenced:
- (en) Concyclic
- (en) Varignon parallelogram
- (en) Varignon's theorem
- see also:
- (en) Pentagon
Funded by: EU Socrates Minerva, HeyMath!, Cambridge University Press