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luas lingkaran = 22/7 x 5^2 = 78,5
luas persegi panjang = 8 x 6 = 48
luas yg diarsir = 78,5 - 48 = 30,5
jawaban B
no 19)
72/360 x 22/7 x 7 x 7 = 30,80
jawaban C
no 20)
soal kurang lengkap , perbandingan sudut AOB dan sudut BOC tdk ada