Basic Proportionality Theorem or Thales Theorem Statement: If a line is drawn parallel to one side of a triangle intersecting the other two sides, then it divides the two sides in the same ratio. Given: A triangle ABC in which DE || BC, and intersects AB in D and AC in E.Converse of Basic Proportionality Theorem Statement: If a line divides any two sides of a … [Read more...] about Basic Proportionality Theorem or Thales Theorem