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Triangles

ICSE · Class 7 · Mathematics

Quick revision notes for Triangles — ICSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

45 questions24 flashcards5 concepts

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Key Topics to Revise

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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.
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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.
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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.
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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.

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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?
Triangles covers several key topics that are frequently asked in ICSE 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 Triangles — ICSE Class 7 Mathematics?
Understand the core concepts first, then work through the 45 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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