Solve problems based on Theorem 7.2: Angles opposite to equal sides of an isoceles triangle are equal. Solve problems based on Theorem 7.3 : The sides opposite to equal angles of a triangle are equal Solve problems based on Theorem 7.4: SSS Congruence rule: If three sides of a triangle are equal to the three sides of another triangle, then the two triangles are congruent Solve problems based on Theorem 7.5: RHS Congruence rule: If in two right triangles the hypotenuse and one side of one triangle are equal to the hypotenuse and one side of other triangle, then the two triangles are congruent.