Item:Q7777: Difference between revisions

@@ Property / has quality @@
+area of plane shape
@@ Property / has quality: area of plane shape / rank @@
+Normal rank
@@ Property / has quality: area of plane shape / qualifier @@
+defining formula:  $A=a^{2}{\frac {\sqrt {3}}{4}}$ 
A=a^2\frac{\sqrt{3}}{4}