Class 6 Maths Understanding Elementary Shapes Classification of Triangle

Classification of Triangle:

The triangle can be classified into two groups based on their sides and angles.

Naming triangles based on sides

If in a triangle, all three sides are unequal, then it is called a Scalene Triangle.

If in a triangle, any two sides are equal, then it is called an Isosceles Triangle.

If in a triangle, all three sides are equal, then it is called an Equilateral Triangle.

   Class_6_Maths_Understanding_Elementary_Shapes_Equilateral_Triangle                    Class_6_Maths_Understanding_Elementary_Shapes_Isoceles_Triangle   Class_6_Maths_Understanding_Elementary_Shapes_Scalene_Triangle

Naming triangles based on angles

If each angle is less than 90°, then the triangle is called an acute angled triangle.

If any one angle is a right angle then the triangle is called a right angled triangle.

If any one angle is greater than 90°, then the triangle is called an obtuse angled triangle.

         Class_6_Maths_Understanding_Elementary_Shapes_Acute_Angled_Triangle                 Class_6_Maths_Understanding_Elementary_Shapes_Right_Angled_Triangle             Class_6_Maths_Understanding_Elementary_Shapes_Obtuse_Angled_Triangle

Problem: Name each of the following triangles in two different ways: (You may judge the nature of angle by observation)

      Class_6_Maths_Understanding_Elementary_Shapes_Different_Types_Of_Angles                                

                                  

Solution:

(a) Acute angled triangle and Isosceles triangle

(b) Right-angled triangle and scalene triangle

(c) Obtuse-angled triangle and Isosceles triangle

(d) Right-angled triangle and Isosceles triangle

(e) Equilateral triangle and acute angled triangle

(f) Obtuse-angled triangle and scalene triangle

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