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bangun a
luas persegi - luas 1/4 lingkaran
(4x4 )- (1/4 x 3,14 x 4x4) = 3,44 cm persegi
bangun b
luas lingkaran besar - luas lingkaran kecil
( 3.14 x 17 x 17) - (3.14 x 7 x 7) = 907.46 - 154 = 753.56