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a=6cm
-obliczam Pp
Pp=1/2 a*h
ale nie mam h, więc obliczam go z twierdzenia pitagorasa:
5^2=3^2+h2
25cm=9cm+h2
h=4 cm
Pp=1/2*6*4=12cm^
V=1/3 Pp*H
V=1/3*12*8=32cm3