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Perpendicular Lines

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

You may want to take a look at Parallel Lines before attempting this problem.

Take a look at the interactivity below which allows you to move the vertices and make different squares.
The adjacent sides of a square are perpendicular to each other.
How would you describe going from one vertex to the next? And to the next? And to the next?...

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