please help help help help
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Answer:
55°
Explanation:
already solved in the given figure.
/_XYZ = /_XZY = 45° (since, XY = XZ)
/_ABY = /_XBC = 45° - 30° = 15°
/_ XCB = 90° - /_XBC = 90° - 15° = 75°
/_CBZ = /_XBC - /_CZB = 75° - 20° = 55°
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