Odpowiedź :
a = 7 dm = 70 cm
b = 20 mm = 2 cm
c = 6 cm
S = 4a + 4b + 4c
S = 4 * 70 cm + 4 * 2 cm + 4 * 6 cm
S = 280 cm + 8 cm + 24 cm
S = 312 cm
a = 7 dm = 70 cm
b = 20 mm = 2 cm
c = 6 cm
S = 4a + 4b + 4c
S = 4 * 70 cm + 4 * 2 cm + 4 * 6 cm
S = 280 cm + 8 cm + 24 cm
S = 312 cm