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
8
Here's how to solve the problem using the properties of angles formed by parallel lines and a transversal.
Part i: If and , find the value of .
Step 1: Identify the relationship between angles and . From the diagram, angles and are alternate interior angles. Since lines AB and CD are parallel (implied by the context of the problem), alternate interior angles are equal.
Step 2: Substitute the given values into the equation.
Step 3: Solve for .
Part ii: If , find the value of and .
Step 1: Use the given angle to find and at the bottom intersection. • Angles and are vertically opposite angles, so they are equal. • Angles and form a linear pair (angles on a straight line), so their sum is . • Angles and are vertically opposite angles, so they are equal. So, , , , .
Step 2: Use the relationships between angles formed by parallel lines and a transversal to find and at the top intersection. Since lines AB and CD are parallel: • Angles and are corresponding angles, so they are equal. • Angles and are corresponding angles, so they are equal. • Angles and are corresponding angles, so they are equal. • Angles and are corresponding angles, so they are equal.
Step 3: List all the angle values.
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Here's how to solve the problem using the properties of angles formed by parallel lines and a transversal.
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.