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Chapter Summary

Triangles

ICSE · Class 7 · Mathematics

Summary of Triangles for ICSE Class 7 Mathematics. Key concepts, important points, and chapter overview.

45 questions24 flashcards5 concepts

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Overview

A triangle is a closed figure with 3 sides, 3 angles, and 3 vertices. Its six parts are the three sides and the three angles. In triangle ABC, vertex A is opposite side BC, vertex B is opposite side AC, and vertex C is opposite side AB. The chapter covers the angle sum property, exterior angles, and

Key Concepts

A triangle is a closed figure

A triangle is a closed figure having 3 sides. It has 3 non-collinear points, 3 sides, 3 angles, and 3 vertices. The vertices are the points where two

The angles inside a triangle

The angles inside a triangle are its interior angles. The sum of interior angles of a triangle is always 180°.

When one side of a triangle

When one side of a triangle is extended, the angle formed outside the triangle at that vertex is an exterior angle. At each vertex, the exterior angle

The two interior angles opposite

The two interior angles opposite to an exterior angle are called its interior opposite angles. An exterior angle of a triangle is equal to the sum of

An acute angled triangle has all

An acute angled triangle has all angles less than 90°. A right angled triangle has one angle equal to 90°. An obtuse angled triangle has one angle mor

Learning Objectives

  • Identify the parts of a triangle: sides, angles, and vertices
  • Use the angle sum property of a triangle
  • Understand exterior angles and interior opposite angles
  • Classify triangles by sides and by angles
  • Use properties of isosceles and equilateral triangles

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.

More resources for Triangles

All 25 chapters — ICSE Class 7 Mathematics Chapter Summary

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