This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
Step 1: Find the angle subtended by arc at the center . The angle at the center is twice the angle at the circumference subtended by the same arc. Given .
Step 2: Identify the angles formed by the tangents and radii. A radius drawn to the point of tangency is perpendicular to the tangent. Therefore, and .
Step 3: Calculate using the sum of angles in quadrilateral . The sum of interior angles in a quadrilateral is . In quadrilateral : Substitute the known angle values:
The final answer is .
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Find the angle subtended by arc XY at the center O. The angle at the center is twice the angle at the circumference subtended by the same arc.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.