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2x + 3 + 3x - 8 = 180°
5x - 5° = 180°
5x = 185°
x = 37°
Besar sudut A
= 2(37°) + 3
= 74° + 3
= 77°
Maka besar penyiku sudut A adalah :
= 90° - 77°
= 13°