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# Chapter 6 - Geo.

### Chapter 6 Theorems/Postulates/Collaries

Postulate/Theorem NamePostulate/Theorem
Angle-Angle (AA) Similarity Postulate if two angles of one triangle are congruent to two angles of another triangle, then the two triangles are similar
if two polygons are similar, then the ratio of their perimeters is equal to the ratios of their corresponding side lengths
Side-Side-Side (SSS) Similarity Theorem if the corresponding side lengths of two triangles are proportional, then the triangles are similar
Side-Angle-Side (SAS) Similarity Theorem if an angle of one triangle is congruent to an angle of a second triangle and the lengths of the sides including these angles are proportional, then the triangles are similar
Triangle Proportionality Theorem if a line parallel to one side of a triangle intersects the other two sides, then it divides the two sides proportionally
Converse of the Triangle Proportionality Theorem if a line divides two sides of a triangle proportionally, then it is parallel to the third side
if three parallel lines intersect two transversals, then they divide the transversals proportionally
if a ray bisects an angle of a triangle, then it divides the opposite side into segments whose lengths are proportional to the lengths of the other two sides
Created by: kgatling