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Revision Notes

Geometric Twins

CBSE · Class 7 · Mathematics

Quick revision notes for Geometric Twins — CBSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

113 questions66 flashcards5 concepts

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Key Topics to Revise

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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.
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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.
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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.
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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.

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Full Notes

Key Concepts

Figures are congruent when they haveIf two triangles have the sameIf two sides and the includedIf two sides and a nonIf two angles and the included

Frequently Asked Questions

What are the important topics in Geometric Twins for CBSE Class 7 Mathematics?
Geometric Twins covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Geometric Twins — CBSE Class 7 Mathematics?
Understand the core concepts first, then work through the 113 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 15 chapters — CBSE Class 7 Mathematics Revision Notes

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