Similar Triangles Review

• Ratios and Proportions

• Similar Polygons

• Proving Triangles Similar

• Proportional Parts

• Numbers are in ratio if they have a common factor.

• Proportions are ratios that are equal

• Similar Polygons have proportional sides

• The scale factor can be found be finding the ratio of a pair of corresponding sides.

• Here, the scale factor is 1/10 because quad ABCD is 1/10 of quad WXYZ.

• Two triangles are similar if:

• There are two pairs of congruent angles (AA)

• There is one pair of congruent angles and the sides of the angles are proportional (SAS)

• All corresponding sides are proportional (SSS)

• When triangles are similar all two-dimensional lengths are proportional

• Medians, Altitudes, Angle Bisectors, Perimeter

• If parallel lines are intersected by two different transversals the sections of the transversals are proportional.

Thanks a lot! See you next time!