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Class 10 (English Medium) · Math · Chapter 6

Triangles

This chapter studies similar triangles. It explains the difference between congruent and similar figures, the Basic Proportionality Theorem (Thales' theorem) and its converse, the three criteria for similarity of triangles (AAA/AA, SSS, SAS), the theorem on the ratio of areas of similar triangles, and the Pythagoras theorem with its converse (retained by many State Boards). It is a proof-and-application-rich chapter important for both CBSE and State Board examinations.

8 sections · ~405 min read · Free, no login needed
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Topics in this chapter

  1. 1

    Introduction and Similar Figures

    40 min read · Quiz included

  2. 2

    Basic Proportionality Theorem (Thales' Theorem)

    45 min read · Quiz included

  3. 3

    Criteria for Similarity of Triangles

    45 min read · Quiz included

  4. 4

    Areas of Similar Triangles

    40 min read · Quiz included

  5. 5

    Pythagoras Theorem and its Converse

    45 min read · Quiz included

  6. 6

    Solved Examples

    90 min read

  7. 7

    Board Previous Year Questions

    80 min read

  8. 8

    Chapter Summary & Quick Revision

    20 min read