Odpowiedź:
Pp = 5 cm * 2 cm = 10 cm²
Pb = 2(5 cm + 2 cm) * 5 cm = 2 * 7 cm * 5 cm = 14 cm * 5 cm = 70 cm²
Pc = 2 * Pp +Pb = 2 * 10 cm² + 70 cm² = 20 cm² + 70 cm² = 90 cm²
b)
Pp = (3 cm * 4 cm)/2 = 12 cm² : 2 = 6 cm²
Pb = (3 cm + 4 cm + 5 cm ) * 4 cm = 12 cm * 5 cm = 60 cm²
Pc = 2 * Pp + Pb = 2 * 6 cm² + 60 cm² = 12 cm² + 60 cm² = 72 cm²
c)
Pp = 4 dm * 2 dm = = 8 dm²
Pb = 2(4 dm + 3 dm) * 6 dm = 2 * 7 dm * 6 dm = 14 dm * 6 dm = 84 dm²
Pc = 2 * Pp + Pb = 2 * 8 dm² + 84 dm² = 16 dm² + 84 dm² = 100 dm²
Szczegółowe wyjaśnienie:
