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90° = 9y + 54° ( 90° karena sudutnya bebentuk siku siku)
90 - 54 = 9y
36 = 9y
4 = y
Sudut BDC
90° = x + 2x
90 = 3x
30 = x
Ditanya x + y ?
30 + 4 = B.34°