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FAQs on Practice Section 2
What we already learned in previous classes
How similarity is different from congruence.
Similar Triangles and their properties
Basic proportionality Theorem or Thales Theorem - 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.
If in a `DeltaABC`; a line DE||BC; intersects AB in D and AC in E; Then `AB`/
`AD` = `AC`/`AE`
Converse of Basis proportionality theorem : If a line divides any two sides of a triangle in the same ratio; then the line must be parallel to the third side.
The internal angle bisector of an angle of a triangle divide the opposite side internally in the ratio of the sides containgthe angle
If a line through one vertex of a triangle divides the opposite sides in the Ratio of other two sides; then the line bisects the angle at the vertex.
The external angle bisector of an angle of a triangle divides the opposite side externally in the ratio of the sides containing the angle.
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