A triangle is a closed figure made of three line segments.
In this figure AB, BC and CA form a closed figure. This is ΔABC.
Here AB, BC and CA are the three sides of a triangle. The point where any two sides of a triangle intersect is called the vertex of the triangle. In this figure A, B, C are the vertices.
Also when two line segments intersect they form an angle at that point. Here AB and BC intersect at B and hence forming an angle ABC. Similarly angle BCA and angle ACB.
A triangle has three vertices, three sides and also three angles. In a triangle the sum of the angles is 180°.
Triangles can be classified into different categories according to the length of the sides or the magnitude of the angles.
Based on the length of the sides it can be classified into three.
They are Equilateral triangle, isosceles triangle and scalene triangle.
Based on the magnitude of the angle it is again classified into three.
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