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13. 45/90 = x/30
x = 45.30/90
x = 1350/90
x = 15 ( b )
14. <BDC = sudut keliling
< AOC = sudut pusat
sudut pusat = 2×sudut keliling
<AOC = 2×30 =60(B)
maaf no 12 aku ga ngerti
maaf jika ada salah
semoga membantu:)