Chapter 6 Quadrilaterals

Section 3 Showing Quadrilaterals are Parallelograms

Example 1: Use Opposite Sides Tell whether the quadrilateral is a parallelogram. Explain your reasoning.

Example 2: Use Opposite Angles Tell whether the quadrilateral is a parallelogram. Explain your reasoning.

Checkpoint: Use Opposite Sides and Opposite Angles Tell whether the quadrilateral is a parallelogram. Explain your reasoning.

Example 3: Use Consecutive Angles Tell whether the quadrilateral is a parallelogram. Explain your reasoning.

Example 4: Use Diagonals Tell whether the quadrilateral is a parallelogram. Explain your reasoning.

Checkpoint: Use Consecutive Angles and Diagonals Tell whether the quadrilateral is a parallelogram. Explain your reasoning.

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