Skip to main content
Super TutorResources
Chapter 15 of 22
Revision Notes

Triangles — Revision Notes

ICSE · Class 6 · Mathematics

Triangles revision notes for ICSE Class 6 Mathematics: 4 topics in quick points. Part of the ICSE Class 6 Mathematics syllabus.

92 questions28 flashcards6 formulas & key relations5 concepts

Interactive on Super Tutor

Studying Triangles? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for revision notes and more.

Try Super Tutor — Free

Free trial, no card needed.

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.

Get complete notes with diagrams and examples

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?
Key topics in Triangles include Basic Elements of a Triangle, Exterior Angles of a Triangle, Types of Triangles, Altitude and Median of a Triangle. Study these first, then practise questions on each for Class 6 exams.
How should I revise Triangles for Class 6 exams?
Learn the core ideas first, then work through the 92 practice questions on Triangles. Revise 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.

More resources for Triangles

All ICSE Class 6 Mathematics Revision Notes

For serious students

Get the full Triangles chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 6 Mathematics. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free