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Proof: Basic Proportionality Theorem for Triangles | Geometry
If a line is drawn parallel to a side in a triangle, so that it intersects the other two sides in two distinct points, then those two sides are cut in the same ratio. This is the basic proportionality theorem for triangles, very related to similar triangles. It is also called the intercept theorem or Thale's theorem. We'll prove this theorem in ...
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