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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apec
Untitled
Golden Rectangles and Golden Spirals
探究長方形對角線上的正方形數目
centripetal force

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Forum_37241_A_EyeballGame3
prec
Translations-5
Another Net of Dodecahedron
Linearization Checker (Calculus)
กราฟ

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Arithmetic Operations
Trapezoid
Upper and Lower Sum or Riemann Sum
Equations
Curve Sketching