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Maka:
∠KLM = 180° - (4x + 12°)
∠KLM = (168° - 4x)
Serta komplemennya adalah (2x-28°)
∠KLM = 90° - (2x-28°)
∠KLM = (118° - 2x)
Samakan kedua persamaan:
168 - 4x = 118 - 2x
4x - 2x = 168 - 118
2x = 50
x = 25°
Bersamaan dengan itu, gunakan salah satu:
∠KLM = 118° - 2(25°)
∠KLM = 118° - 50°
∠KLM = 68°