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?

New Resources

Flip Flop
Kopie von parabel - parabol
bearing HK
Periodic Functions
Shade a spheric triangle with "surface".

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Math 2 Grades
two circles in a rectangle - I
Untitled
การบวกจำนวนเต็ม
Love (Circle, Functions, Reflection)

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Boxplot
Parallelogram
Division
Binomial Distribution
Scatter Plot