1. hitunglah busur BC 2. Jika panjang busur AB= 12 Cm Hitunglah panjang busur CD
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1. Jika ∠BOC siku-siku:
Panjang busur/K lingkaran = Sudut pusat/360°
BC/2πr = ∠BOC/360°
BC/(2 x 22/7 x 7) = 90°/360°
BC/44 = 1/4
BC/11 = 1/1
BC = 11 cm
Jadi, panjang busur BC adalah 11 cm.
2. Panjang busur/K lingkaran = Sudut pusat/360°
Busur/Sudut = K/360°
Busur x 360/Sudut = Busur x 360/Sudut
CD x 360/60 = AB x 360/30
CD x 6 = 12 x 12
CD = 12 x 12/6
CD = 12 x 2
CD = 24 cm
Jadi, panjang busur CD adalah 24 cm.