Objective: I can use the SSS, SAS, ASA Postulates to prove

triangles congruent.

4-2 Some Ways to Prove Triangles Congruent (p. 122)

– If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent.

– Name the congruence.

A

B C

R

M

L

Postulate 12 SSS Postulate

Postulate 13 SAS Postulate

– If two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent.

– Name the congruence.

X

J

K

NY

Z

Postulate 14 ASA Postulate– If two angles and the included side of one triangle

are congruent to two angles and the included side of another triangle, then the triangles are congruent.

– Name the congruence.

A

T

Y

OF

R