Răspuns :
raza cercului circumscris R= abc/4S
S=l²√3/4=12²√3/4= 144√3/4= 72√3
abc=3l=3*12=36
R=36/72√3= 1/2√3 rationalizam
R=√3/3*2= √3/6
S=l²√3/4=12²√3/4= 144√3/4= 72√3
abc=3l=3*12=36
R=36/72√3= 1/2√3 rationalizam
R=√3/3*2= √3/6