The sum of internal angles in parallelogram is 360° There are 2 angles measured x° and there are 2 angles measured 66°. So the equation will be ∠1 + ∠2 + ∠3 + ∠4 = 360° x° + x° + 66° + 66° = 360°
Work on it x° + x° + 66° + 66° = 360° 2x + 132 = 360 2x = 360 - 132 2x = 228 x = 228/2 x = 114
