Item:Q7812: Difference between revisions

@@ Property / has quality @@
+inradius
@@ Property / has quality: inradius / rank @@
+Normal rank
@@ Property / has quality: inradius / qualifier @@
+defining formula:  $r={\frac {t}{2\tan(\pi /5)}}={\frac {t}{2{\sqrt {5-{\sqrt {20}}}}}}$ 
r=\frac{t}{2\tan ( \pi /5)}=\frac{t}{2\sqrt{5-\sqrt{20}}}
@@ Property / has quality @@
+circumradius
@@ Property / has quality: circumradius / rank @@
+Normal rank
@@ Property / has quality: circumradius / qualifier @@
+defining formula:  $R={\frac {a}{2}}\csc {\frac {\pi }{5}}$ 
R = \frac{a}{2}\csc\frac\pi{5}