∠BOA + ∠AOF + ∠FOE = 180°
3x + 90° + 2x = 180°
3x + 2x = 180° - 90°
5x = 90°
x = 90° / 5
x = 18°
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∠BOA + ∠AOF + ∠FOE = 180°
3x + 90° + 2x = 180°
3x + 2x = 180° - 90°
5x = 90°
x = 90° / 5
x = 18°
Semoga membantu! :)