Sekeping uang logam mempunyai diameter 3,5 hitunglah luas uang logam tersebut jika: v:22_7 V=3,14

d = 3,5 → r = 7/4

jika π = 22/7,
L = π × r × r = 22/7 × 7/4 × 7/4 = 77/8

jika π = 3,14
L = π × r × r = 3,14 × 7/4 × 7/4 = 9,62