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V - objętość stożka = 120Π cm³
V = 1/3 razy Πr²h = Πr²h/3
3V = Πr²h
r² = 3V/Πh = 3 razy 120Π/10Π = 3 razy 12 = 36
r = √36 = 6 cm
l - tworząca = √h² + r² = √10² + 6² = √136 = 2√34