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Revision Notes

Triangles

ICSE · Class 6 · Mathematics

Quick revision notes for Triangles — ICSE Class 6 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

92 questions28 flashcards5 concepts

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Key Topics to Revise

1

Basic Elements of a Triangle

  • A triangle is a closed figure formed by three line segments.
  • It has 3 sides, 3 vertices, and 3 interior angles.
  • The sum of all interior angles of a triangle is always 180°.
2

Exterior Angles of a Triangle

  • An exterior angle is formed when one side of a triangle is extended.
  • Each exterior angle is adjacent to an interior angle and forms a linear pair (sum = 180°).
  • An exterior angle is equal to the sum of the two opposite interior angles.
3

Types of Triangles

  • Triangles are classified based on angles and sides.
  • Based on angles: Acute-angled, Right-angled, Obtuse-angled.
  • Based on sides: Scalene, Isosceles, Equilateral.
4

Altitude and Median of a Triangle

  • An altitude is a perpendicular line from a vertex to the opposite side.
  • A triangle has three altitudes, and they meet at a point called the orthocentre.
  • A median joins a vertex to the midpoint of the opposite side.

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Full Notes

Key Concepts

A triangle is a closed shapeTriangles can be classified based onTriangles can also be classified byWhen a side of a triangleAn altitude is a perpendicular line

Frequently Asked Questions

What are the important topics in Triangles for ICSE Class 6 Mathematics?
Triangles covers several key topics that are frequently asked in ICSE Class 6 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Triangles — ICSE Class 6 Mathematics?
Understand the core concepts first, then work through the 92 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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