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: Prove that opposite sides of parallelogram PQRS are equal. Given that PQRS is a parallelogram, we know that and . Draw a diagonal PS. Consider and : • (Alternate interior angles, since ) • (Alternate interior angles, since ) • (Common side) Therefore, (Angle-Side-Angle congruence criterion). Since the triangles are congruent, their corresponding sides are equal: • • Thus, the opposite sides of the parallelogram are equal.
Step 2: Calculate the value of for parallelogram EFGH. In a parallelogram, consecutive angles are supplementary. Therefore, . Substitute the given expressions for and : The value of is .
Step 3: Determine the size of . In a parallelogram, opposite angles are equal. Therefore, . First, calculate the measure of using the value of found in Step 2: Since : The size of is .
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Prove that opposite sides of parallelogram PQRS are equal. Given that PQRS is a parallelogram, we know that PQ RS and PR QS.
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.