keliling diameter koin

Rp. 500 memiliki diameter 27 mm (2,7 cm), keliling = 3,14 × 27 mm = 84,78 mm (8,478cm)

Rp. 200 memiliki diameter 25 mm (2,5 cm), keliling = 3,14 × 25 mm = 78,5 mm (7,85 cm) 

Rp. 100 memiliki diameter 23 mm (2,3 cm), keliling = 3,14 × 23 mm = 72,22 mm (7,222 cm)