Class 7 CBSE The Triangle and Its Properties

About This Chapter

Discover the fascinating properties of triangles - medians, altitudes, angle sum property, exterior angle property, and the Pythagoras theorem for right-angled triangles.

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Chapter Sections

1

Introduction

Elements of a triangle.
2

Medians of a Triangle

Line joining vertex to midpoint of opposite side.

MedianCentroid
3

Altitudes of a Triangle

Perpendicular from vertex to opposite side.

AltitudeOrthocentre
4

Altitudes vs Medians

Comparison between the two.
5

Exterior Angle Property

Exterior angle equals sum of interior opposite angles.

Exterior Angle
6

Angle Sum Property

Sum of angles is 180°.

Angle Sum180°
7

Equilateral and Isosceles

Special triangle properties.

EquilateralIsosceles
8

Triangle Inequality

Sum of two sides > third side.
9

Pythagoras Theorem

The famous a² + b² = c² for right triangles.

PythagorasRight Angle
10

Exercise 6.1

Practice problems.
11

Exercise 6.2

Practice problems.
12

Exercise 6.3

Practice problems.
13

Exercise 6.4

Practice problems.
14

Exercise 6.5

Practice problems.
15

What Have We Discussed?

Chapter summary.
16

Extra Curriculum Support

Additional resources.