Find x + y + z

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#### Solution

*x* + 90° = 180° (Linear pair)

*x* = 90°

*z* + 30° = 180° (Linear pair)

*z* = 150°

*y* = 90° + 30° (Exterior angle theorem)

*y* = 120°

*x + y + z* = 90° + 120° + 150° = 360°

Concept: Angle Sum Property of a Quadrilateral

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