Geometric Twins
CBSE · Class 7 · Mathematics
Complete topic list for Geometric Twins in CBSE Class 7 Mathematics. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Geometric Twins
1. Congruent Figures
- Figures with the same shape and size are congruent.
- Congruent figures can be superimposed exactly.
- A figure may be rotated or flipped before superimposing.
2. Congruence of Triangles by SSS
- If two triangles have the same three side lengths, they are congruent.
- This is called the SSS condition, which stands for Side Side Side.
- In the construction idea, a triangle with sides 4 cm, 6 cm, and 8 cm can be formed in more than one position, but all such triangles are congruent.
3. Writing Triangle Congruence Correctly
- If triangle ABC is congruent to triangle XYZ, then A matches X, B matches Y, and C matches Z.
- The matching sides are AB with XY, BC with YZ, and AC with XZ.
- The matching angles are angle A with angle X, angle B with angle Y, and angle C with angle Z.
4. Other Triangle Congruence Conditions
- SAS means Side Angle Side: two sides and the included angle are equal.
- ASA means Angle Side Angle: two angles and the included side are equal.
- AAS means Angle Angle Side: two angles and a non-included side are equal.
Key Concepts
Central concept: Congruence in triangles and figures
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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