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2014-09-13T12:43:22+03:00
L=4√3

R=abc/4S

S= l²√3/4= (4√3)²√3/4= 16*3√3/4= 12√3

abc=4√3*4√3*4√3= 192√3

R=192√3 * 4*12√3= 192/48=4