Skip to main content
Super TutorResources
Chapter 17 of 25
Revision Notes

Triangles — Revision Notes

ICSE · Class 7 · Mathematics

Triangles revision notes for ICSE Class 7 Mathematics: 4 topics in quick points. Part of the ICSE Class 7 Mathematics syllabus.

45 questions24 flashcards8 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

1. Basic Parts of a Triangle

  • A triangle has three non-collinear points, three sides, three angles, and three vertices.
  • The six parts or elements of a triangle are its three sides and three angles.
  • In triangle ABC, vertex A is opposite side BC, B is opposite AC, and C is opposite AB.
2

2. Angles in a Triangle

  • The sum of interior angles of a triangle is always 180°.
  • Interior angles are the angles that lie inside the triangle.
  • An exterior angle is formed when a side of the triangle is produced.
3

3. Classification of Triangles

  • Triangles can be classified by angles and by sides.
  • By angles: acute angled, right angled, and obtuse angled triangles.
  • By sides: scalene, isosceles, and equilateral triangles.
4

4. Isosceles and Equilateral Triangle Properties

  • In an isosceles triangle, the angle between the equal sides is called the vertical angle or angle of vertex.
  • The third side, which is unequal, is called the base.
  • The two angles opposite the equal sides are called base angles.

Get complete notes with diagrams and examples

Full Notes

Key Concepts

A triangle is a closed figureThe angles inside a triangleWhen one side of a triangleThe two interior angles oppositeAn acute angled triangle has all

Frequently Asked Questions

What are the important topics in Triangles for ICSE Class 7 Mathematics?
Key topics in Triangles include Basic Parts of a Triangle, Angles in a Triangle, Classification of Triangles, Isosceles and Equilateral Triangle Properties. Study these first, then practise questions on each for Class 7 exams.
How should I revise Triangles for Class 7 exams?
Learn the core ideas first, then work through the 45 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 7 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 7 Mathematics. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free