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360 / 20 × 3
18 × 3
54 cm
Besar sudut COD :
α/360 × 54= 9
α/20 × 3= 9
3α/20= 9
3α= 9 × 20
3α= 180
α = 180/3
α= 60
Jadi, besar sudut COD adalah 60° ( c ).