Geometry Practice Test 1

In Δyoz,
∠oyz + ∠ozy + 110 = 180°
∠oyz + ∠ozy = 70°
In Δxyz,
∠y + ∠z = 2 (∠oyz + ∠ozy)
∠y + ∠z = 2 (70°)
∠y + ∠z = 140°
∠x = 180° - ∠y - ∠z
∠x = 180° - 140°
∠x = 40°