Odpowiedź:
zad 2
π = 3,14
a)
d = 4 cm l = πd = 3,14 * 4 cm ≈ 12,56 cm
b)
d = 2 mm l = πd = 3,14 * 2 mm ≈ 6,28 mm
zad 3
r = 8 m
l = 2πr = 2 * 3,14 * 8 m ≈ 50,24 m
r = 350 m
l = 2πr = 2 * 3,14 * 350 m = 2198 m