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Mohon koreksi...senang bisa membantu :)
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Mapel : MatematikaKelas : VII SMP
Bab : Sudut
Pembahasan :
< AOC = 70°
< COB = 180° - 70°
< COB = 110°
< CDB = 1/2 . < COB
< CDB = 1/2 . 110°
< CDB = 55°