Exercise 1 In earlier lessons, we have defined congruent to mean that there exists a sequence of rigid motions that maps one figure to the other. Congruent also means that all corresponding sides and angles are equal in measure. In order to prove triangles are congruent using their sides and angles (instead of using rigid motions), we do not need to prove all of their corresponding sides and angles are congruent. Instead we will look at criteria that refer to a few special groups of corresponding parts that will prove one triangle is congruent to another. We will start with: Side-Angle-Side Triangle Congruence Criteria (SAS) Triangles ABC and A'B'C' are marked below to show some corresponding parts are congruent. What parts are congruent? Notice that there is a sequence of rigid motions that maps AABC A'B'C' . Step 1: Translation Step 2: Rotation B' Step 3: Reflection B"" SIDE-ANGLE-SIDE (S.A.S.) THEOREM Two triangles are congruent if two sides and the included angle of one are equal (or congruent) to two sides and the included angle of the other.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
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Exercise 1
In earlier lessons, we have defined congruent to mean that there exists a sequence of rigid motions that
maps one figure to the other.
Congruent also means that all corresponding sides and angles are equal in measure.
In order to prove triangles are congruent using their sides and angles (instead of using rigid motions), we do
not need to prove all of their corresponding sides and angles are congruent. Instead we will look at criteria
that refer to a few special groups of corresponding parts that will prove one triangle is congruent to another.
We will start with: Side-Angle-Side Triangle Congruence Criteria (SAS)
Triangles ABC and A’B'C' are marked below to show some corresponding parts are congruent.
What parts are congruent?
Notice that there is a sequence of rigid motions that maps AABC=A'B'C' .
Step 1: Translation
Step 2: Rotation
B'
Step 3: Reflection
B""
SIDE-ANGLE-SIDE (S.A.S.) THEOREM
Two triangles are congruent if two sides and the included angle of one are equal (or congruent) to two
sides and the included angle of the other.
Transcribed Image Text:Exercise 1 In earlier lessons, we have defined congruent to mean that there exists a sequence of rigid motions that maps one figure to the other. Congruent also means that all corresponding sides and angles are equal in measure. In order to prove triangles are congruent using their sides and angles (instead of using rigid motions), we do not need to prove all of their corresponding sides and angles are congruent. Instead we will look at criteria that refer to a few special groups of corresponding parts that will prove one triangle is congruent to another. We will start with: Side-Angle-Side Triangle Congruence Criteria (SAS) Triangles ABC and A’B'C' are marked below to show some corresponding parts are congruent. What parts are congruent? Notice that there is a sequence of rigid motions that maps AABC=A'B'C' . Step 1: Translation Step 2: Rotation B' Step 3: Reflection B"" SIDE-ANGLE-SIDE (S.A.S.) THEOREM Two triangles are congruent if two sides and the included angle of one are equal (or congruent) to two sides and the included angle of the other.
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