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Maka:
Sudut A + Sudut B = 90°
(2x+8)° + (x+13)° = 90°
3x + 21 = 90
3x = 69
x= 23
Maka besar sudut A
(2x + 8)° = 2(23) + 8
= 46 + 8 = 54°
Jadi jawabannya D.