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Dik : Sudut S = Sudut Q = 140°
Sudut P = 30°
Dit : Sudut R : ?
Jawab :
Jumlah sudut layang layang = S + Q + P + R
360° = 140° + 140° + 30° + R
360° = 310° + R
R = 360° - 310°
R = 50°