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2014-08-10T18:02:42+03:00
R=1
R=abc/4S

S=AB*BC * sin<B/2

R=BC * AC* AB/4 * AB *BC * sin <B/2

R=  AC/ 4 * sin <B/2

R= AC / 2* π/3

1= AC/2π/3

AC= 2π/3
1 5 1