Compare geometric relationships between euclidean and spherical geometries, including parallel lines and the sum of the angles in a triangle

Popular Tutorials in Compare geometric relationships between euclidean and spherical geometries, including parallel lines and the sum of the angles in a triangle

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  What are Parallel Lines?

  Lines that are parallel have a very special quality. Without this quality, these lines are not parallel. In this tutorial, take a look at parallel lines and see how they are different from any other kind of lines!

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  What are Skew Lines?

  Ever heard of skew lines? They're pretty cool! Take a look at this tutorial and you'll be introduced to skew lines.