10) 40/20 × 50
= 200 / 20 = 100°
11) sudut (AOD + DOC + BOC ) = 180°
90° + 30° + BOC = 180°
BOC = 180 - 120
BOC = 60°
panjang busur BC
27/90 × 60
= 27 × 2 /3
= 54 /3
= 18 cm (C)
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10) 40/20 × 50
= 200 / 20 = 100°
11) sudut (AOD + DOC + BOC ) = 180°
90° + 30° + BOC = 180°
BOC = 180 - 120
BOC = 60°
panjang busur BC
27/90 × 60
= 27 × 2 /3
= 54 /3
= 18 cm (C)