Hijery ny fangon'i Dimilafy

[[Sary:Regular polygon 5.svg|200px|ankavanana|thumb|Dimimira]]

Ny '''dimilafy''' ([[Fiteny grika taloha|Grika taloha]]: πεντάγωνον) dia karazana endrika iray manana lafy dimy. Antsoina hoe '''dimimira''' izay dimilafy manana lafy dimy mitovy halava.

== Dimimira ==

Ny velaran'ny dimimira manana halavan-dafy tokana ihany dia : 
: <math>A = \frac{{t^2 \sqrt {25 + 10\sqrt 5 } }}{4} = \frac{5t^2 \tan(54^\circ)}{4} \approx 1.720477401 t^2.</math>

[[Sokajy:Jeômetria]]