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r lingkaran besar = 14 cm
r lingkaran kecil = 14/2=7 cm
= 22/7
luas 1/2 lingkaran besar
= x r ling. besar x 1/2
= 22/7 x x 1/2
= 308
luas 1/2 lingkaran kecil
= x r ling. kecil x 1/2
= 22/7 x x 1/2
= 77
luas ling. besar - luas ling kecil
= 308-77= 231 (b)