Objective

To classify polygons in the coordinate plane

But is there a way to know for sure?

Recall the definition and properties of a parallelogram:

• Opposite sides are parallel

• Opposite sides are congruent

• Opposite angles are congruent

• ​Consecutive angles are supplementary

• Diagonals bisect each other​

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And also:

• Congruent segments have the same length

• Parallel segments have the same slope​

You'll need these formulas

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