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90° = AOC + COB
90° = 6x + 4 + 5x + 9
90° = 11x + 13
90 - 13 = 11x
77 = 11x
7 = x
sudut AOC =
6x + 4
6 x 7 + 4
42 + 4
46°
penyiku sudut AOC
= 90° - AOC
= 90° - 46°
= 44°