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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International Day of Mathematics 2025
גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
探究長方形對角線上的正方形數目

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