Alternate Interior Angles

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I constructed the alternate interior angles congruent. If you change the angle measurements, are the lines still parallel? If you move the lines, are the lines still parallel?

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Proving Triangles Congruent (2): One Step Transformations
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Snake year !
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Geometric sequence calculator
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Caories consumed and expended
points of concurrency
Broken Plate (Problem)

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Conditional Probability
Percentages
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Triangles
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