Zadanie 8.
Pc = 120 dm²
Pb = 120 : 4 = 30 dm²
Pc = 2 · Pp + Pb
2 · Pp + 30 = 120 l -30
2 · Pp = 90 l :2
Pp = 45 cm²
Odp. Pole podstawy tego graniastosłupa wynosi 45 dm²
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Zadanie 8.
Pc = 120 dm²
Pb = 120 : 4 = 30 dm²
Pc = 2 · Pp + Pb
2 · Pp + 30 = 120 l -30
2 · Pp = 90 l :2
Pp = 45 cm²
Odp. Pole podstawy tego graniastosłupa wynosi 45 dm²