Odpowiedź :
Hej!
P = 2ab + 2bc + 2ac
a = 0,5 dm = 5 cm
b = 3 cm
c = 8 cm
P = (2 * 5 cm * 3 cm) + (2 * 3 cm * 8 cm) + (2 * 5 cm * 8 cm)
P = 30 cm² + 48 cm² + 80 cm²
P = 158 cm²
Pozdrawiam! - Julka
Hej!
P = 2ab + 2bc + 2ac
a = 0,5 dm = 5 cm
b = 3 cm
c = 8 cm
P = (2 * 5 cm * 3 cm) + (2 * 3 cm * 8 cm) + (2 * 5 cm * 8 cm)
P = 30 cm² + 48 cm² + 80 cm²
P = 158 cm²
Pozdrawiam! - Julka