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4.1 Triangles and Angles 4.2 Congruence and Triangles 4.3 Proving Triangles are Congruent: SSS and SAS 4.4 Proving Triangles are Congruent: ASA and AAS 4.5 Using Congruent Triangles 4.6 Isosceles, Equilateral, and Right Triangles 4.7 Triangles and Coordinate Proof
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