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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Step 1: Understand the angles formed by intersecting lines. When two straight lines intersect, they form two pairs of vertically opposite angles. Adjacent angles form a linear pair, meaning they sum to . One acute angle and one obtuse angle will be adjacent to each other.
Step 2: Calculate the measure of an adjacent obtuse angle. Given that one acute angle is , the adjacent obtuse angle (which forms a linear pair with it) can be found by subtracting the acute angle from .
Step 3: Determine the vertically opposite obtuse angle. Vertically opposite angles are equal. The angle calculated in Step 2 is an obtuse angle. The question asks for the size of the vertically opposite obtuse angle. Since vertically opposite angles are equal, the vertically opposite angle to the obtuse angle is also .
The size of the vertically opposite obtuse angle is .
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Understand the angles formed by intersecting lines. When two straight lines intersect, they form two pairs of vertically opposite angles.
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.