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什么是平移、平行线和角度？

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Topics in 什么是平移、平行线和角度？

Numbered in the order to learn them.

  1. 两点决定一条直线

  2. 三点决定一个平面

  3. 空间里的直线和平面

  4. 什么是几何？

  5. 两条不同的直线只能相交于一点

  6. 两条非平行线总会相交

  7. 三角形的重要性

  8. What Are Axioms or Postulates?

  9. What Is the Parallel Postulate?

  10. Spheres and Non-Euclidean Geometry

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