equlateral triangel inside serkel wen input=serkel radius
all angels=60 deg
hite=side*kosine(30)=side*root(3)/2
area=base*hite/2=side*side*root(3)/4 =0.4330127*side*side
senter av serkels (inside & outside) is on vertikal line thru triangel top &
midpoint av base
distans from senter tu base=radius av inside serkel
Draw lines from senter tu 3 korners av triangel...get 3 idenikal wek triangels
(from senter tu points av equilateral triangel=outside serkel radius)
inside serkel radius=(1/2) outside serkel radius=(1/2)Radius
base=(side/2)=(outside radius)*kosine(30 deg)=1.7320508*Radius
tri area=(hite*base/2)=(1.5*outradius)*(root(3)*outradius/2
=1.29903106*(out rad)*(out rad)