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CHAPTER AT A GLANCE
Triangles
•Unit: Geometry
•Board weightage: Geometry carries about 15 marks out of 80; this chapter usually gives one proof question (3 or 5 marks) and a few short questions (please check the latest sample paper)
•This textbook edition covers: similar figures, the Basic Proportionality Theorem and its converse, and three similarity criteria (Angle-Angle-Angle, Side-Side-Side, Side-Angle-Side). The theorem on areas of similar triangles and the proof of the Pythagoras theorem are not in this chapter of this edition; the Pythagoras theorem is used as an already known result.
•Most scoring part: proofs using similar triangles and the Basic Proportionality Theorem
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