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d=18
h²+a²=d²
h²=18² - 12²
h²=324 - 144
h=√180
h= 6√5
V=a²×h
V=144×6√5
V= 864√5
Objętość tego graniastosłupa wynosi 864√5 cm³
Obliczamy h z Twierdzenia Pitagorasa