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sudut pusat = 2x sudut keliling
maka sudut keliling = 120/2 = 60 (a)
15. besar sudut keliling yg mnghadap diamet
lingkaran = 90 (c)
16. dec = 1/2 (cod +aob )
dec = 1/2 (110 + 40 ) = 75 (a)