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**Topics covered**

Definition of Triangle; Types of Triangles- On the basis of Sides, On The basis of Angles; Terms Related to a Triangle- Median & Centroid, Altitude & Orthocentre; Theorem 1; Exterior Angle of a Triangle- Theorem 2;Congruent Figures; Congruence of Triangles; SAS Congruence Criteria- Theorem 3, Theorem 4; ASA Congruence Criteria- Theorem 5AAS Congruence Criteria- Theorem 6, Theorem 7;SSS Congruence Criteria- Theorem 8, RHS Congruence Criteria, Theorem 9;Inequality relations in triangle- Theorem 10, Theorem 11, Theorem 12;

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