### Mathematics Class VI

Knowing Our Numbers
Whole Numbers
Playing With Numbers
Basic Geometrical Ideas
Fractions
Integers
Decimals
Data Handling
Mensuration
Algebra
Ratio and Proportion
Practical Geometry
Symmetry

# Classification of Triangles

• We know that a triangle is a polygon with the least number of sides. There are different types of triangle.

Triangle can be classified on the basis of their angles as follows:

• If each angle of a triangle is acute, it is called an acute-angled triangle.
• Any angle of a triangle is a right angle, it is called a right-angled triangle.
• Any angle of triangle is obtuse angle, it is called an obtuse-angled triangle.

The triangles can be also be classified on the basis of the lengths of their sides as follows:

• All the three sides of a triangle are of unequal length, it is called a scalene triangle.
• Any two of the sides of a triangle are equal, it is called an isosceles triangle.
• All the three sides of a triangle are of equal length, it is called an equilateral triangle.
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