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Diagrams 11 and 12 demonstrate conditions for proving quadrilaterals are parallelograms using angle measures and side markings.

Two geometric diagrams illustrating methods to prove quadrilaterals are parallelograms, labeled 11 and 12, showing angle and side markings.

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Show Answer Key & Explanations Step-by-step solution for: Proving Quadrilaterals are Parallelograms Worksheet (with ...

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- For problem 11: The quadrilateral is a parallelogram because consecutive angles are supplementary (60° + 120° = 180°), which implies that opposite sides are parallel.
- For problem 12: The quadrilateral is a parallelogram because the diagonals bisect each other, as indicated by the congruent segments formed at their intersection.

Parent Tip: Review the logic above to help your child master the concept of proving quadrilaterals are parallelograms worksheet.

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Proving Quadrilaterals are Parallelograms Worksheet (with ...