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r = h*2/3
stąd h = r *3/2 = 6*3/2 =9 j
h=r/2/3
h=3/2r
h=3/2*6
h=18/2
h=9
r = 2h/3
h = 3r/2
h = 3*6/2
h = 18/2
h = 9