Download Section 7.4-7.5 Review Triangle Similarity

Section 7.4-7.5
Review
Triangle Similarity
Similar Triangles
Triangles are similar if
(1)
(2)
their corresponding (matching)
angles are congruent (equal) and
the ratio of their corresponding
sides are in proportion. The name
for this proportion is the scale
factor.
Theorems

There are three theorems that you
can use to prove two triangles
similar.
AA Similarity
SSS Similarity
SAS Similarity (included angles)
SSS Similarity

If there is a matching such that
corresponding sides in a pair of
triangles are proportional, then the
triangles are similar.

In English - All three sides must have
the same proportion (scale factor)
SAS Similarity

If a pair of matching sides in a pair of
triangles have proportional lengths
and their included angles are equal
then the pair of triangles are similar.

Look for --> Proportion, Equal,
Proportion
AA Similarity

Triangles are similar if the measures
of two interior angles in one triangle
are equal to the corresponding
angles in another triangle.

Why just two? If you know two
angles the third angle is not
negotiable.