JCERT · Class 7 · Chapter 15 · Congruence of Triangles. Topic notes aligned to the official chapter; these are not solutions to every textbook exercise.
JCERT · Class 7 · Chapter 15 · Congruence of Triangles. Topic notes aligned to the official chapter; these are not solutions to every textbook exercise.
JCERT · Regular schools (Non-SOE) · Class 7 · Chapter 15 — Congruence of Triangles
Official syllabus pages 211–224. Official syllabus · Prescribed Hindi book (22 chapters) · Separate supplementary reference.
These topic notes and teaching examples are not a complete answer key to every textbook question. English notes use this same JCERT chapter order; a matching English textbook PDF has not been verified.
Congruent figures coincide after a translation, rotation or reflection. Triangle criteria include SSS, SAS, ASA and RHS. Preserve corresponding vertex order. AAA gives the same shape but does not guarantee the same size.
All three corresponding sides match. For SAS, the angle must be included between the specified sides.
SSS: 3 = 3, 4 = 4, 5 = 5
All three corresponding sides match. For SAS, the angle must be included between the specified sides.
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