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h=6 - wysokość
Obwód = 30
Pole S=48
S = a*h
a = S/h = 48/6 = 8 cm
Obwód = 2a+2b
2b = O - 2a
b = O/2 - a
b = 30/2 - 8 = 15-8 = 7 cm
Pozdrawiam! :D