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Keliling lingkaran = 157 cm
π × d = 157
3,14 × d = 157
d = 157 : 3,14
d = 50
jari-jari = 50 : 2 = 25
Luas lingkaran = πr²
Luas lingkaran = 3,14 × 25²
Luas lingkaran = 1962, 5 cm²
Luas juring omn = 31,4 × 1962,5 : 157
Luas juring omn = 392,5 cm²
Atau
Luas juring omn = 72 × 1962,5 : 360
Luas juring omn = 392,5 cm²