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3a= krawędź boczna
2a²+4a×3a=350
2a²+12a²=350
14a²=350
a²=350:14
a²=25
a=5cm= bok podstawy
h=3a=3×5=15cm
v=a²h=5²×15=375cm³
Pp=a²
h=3a
Pc=2Pp+Pb
Pb=4ah
350=2*a²+4a*3a
350=2a²+12a²
14a²=350
a²=25
a=5 cm
h=3*5
h=15 cm
V=5²*15
V=25*15
V=375 cm³