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2014-08-10T12:21:55+03:00
A=9√3/4
A=l²√3/4

l²√3/4= 9√3/4

l²√3= 9√3

l²=9  =>l=3

l= R√3

R√3=3

R= 3/√3=  3√3/3=  √3

ap= R/2= √3/2