6th Standard Maths Term 2 Unit 4 Geometry - Basic Elements of a Triangle

Chapter: 6th Maths : Term 2 Unit 4 : Geometry

Basic Elements of a Triangle

Basic Elements of a Triangle

Mark 3 points A, B, C on a paper, such that they do not lie on a straight line. Join the line segments AB, BC and CA.

This forms a triangle ABC represented as Δ ABC or Δ BCA or Δ CAB.

In Δ ABC, the line segments AB, BC and CA are called the sides of the triangle and ∠CAB, ∠ABC and ∠BCA (∠A, ∠B & ∠C) are called the angles of the triangle. The point of intersection of two sides of the triangle is called the vertex. A, B and C are three vertices of ∆ ABC. Hence, a triangle has 3 sides, 3 angles and 3 vertices.

3 Sides

3 Angles

3 Vertices

Think
Can a triangle be drawn using 3 points on a straight line?

[Image showing 3 collinear points A, B, and C on a straight line]