Ответ:

R=a/sqrt(3) = > a=R*sqrt(3)

a=12sqrt(3)

p=3a=36sqrt(3)

 

r=a/2sqrt(3) => r=12sqrt(3)/2sqrt(3)=6

c=2pir

c=12pi

p/c=36sqrt(3)/12pi=3sqrt(3)/pi