Item:Q7806: Difference between revisions

@@ Property / subclass of @@
+orthodiagonal quadrilateral
@@ Property / subclass of: orthodiagonal quadrilateral / rank @@
+Normal rank
@@ Property / subclass of @@
+convex quadrilateral
@@ Property / subclass of: convex quadrilateral / rank @@
+Normal rank
@@ Property / subclass of @@
+tangential quadrilateral
@@ Property / subclass of: tangential quadrilateral / rank @@
+Normal rank
@@ Property / has quality @@
+area
@@ Property / has quality: area / rank @@
+Normal rank
@@ Property / has quality: area / qualifier @@
+defining formula:  $A={\frac {d_{1}d_{2}}{2}}$ 
A =\frac{d_1d_2}{2}