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CHAPTER AT A GLANCE
Geometric Twins
•Unit: Geometry
•Board weightage: Congruence of figures and triangles, the conditions SSS, SAS, ASA, AAS and RHS, corresponding parts and angles of isosceles and equilateral triangles give regular 1-mark, 2-mark, 3-mark and 4-mark questions (please check the latest sample paper)
•Key ideas from the textbook: congruent figures, superimposition, corresponding vertices sides and angles, writing congruence in order, SSS, SAS, ASA, AAS, RHS, why SSA and AAA do not work, angles opposite equal sides, angles of an equilateral triangle
•Most scoring part: writing the reasons in the correct order (given, condition used, congruence statement, conclusion) with the vertices matched in the right order
•Time to revise: about 60 minutes
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