Alternate Interior Angles

Investigate

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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Nobody Likes to Be a Semicircle
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Ogee Arch - Construction

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Imperfect Hex Pipe
Celestial Sphere
Escher Tessellation
Fourier Transform animation: Saw tooth
JoinCorners

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Combinatorics
Unit Circle
Limits
Similar Triangles
Triangles