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