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d²=9+16
√d²=√25
d=5
krawędź boczna prostapadłościanu-
b²+5²=13²
b²=169-25
√b²=√144
b=12
wymiary prostopadłościanu= 3cm x 4cm x 12cm
V=3×4×12=144cm³ lub
V= Pp×H
V= 12×12= 144cm³