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z pitagorasa wylicz ile ma H czyli:
(8√2) ^2 + H^2 = 12 ^2
128 + H^2 = 144
H^2 = 16
H = 4
Pp= 4 * 4
Pp= 16
V= 1/3Pp * H
V= 1/3 * 16 * 4
V= 64/3
V= 21 1/3 [cm ^3]