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: Identify the given parallel lines and angles. We are given that . We have and . We need to find the value of angle , which is .
Step 2: Draw an auxiliary line through point parallel to and . Let's draw a line passing through such that .
Step 3: Use the property of alternate interior angles. Since , the alternate interior angles are equal. Therefore, .
Step 4: Use the property of alternate interior angles again. Since , the alternate interior angles are equal. Therefore, .
Step 5: Calculate the angle . From the diagram, angle is the sum of and . The value of the angle marked is .
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Identify the given parallel lines and angles. We are given that PQ RS.
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.