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r = 1/3 h
13/h= 3 cm I * 3
h= 9 cm
h= a√3 /2
9=a√3/2 I * 2
18 = a√3 I : √3
18/√3= a *(18 / √3)
18/√3 * √3/√3 =18 √3 / 3 = 6 √3 .
18=a√3
a=6√3
Bok trójkąta ma długość 6√3cm.