Classification of Triangle



In classification of triangle there are six elements in a triangle, that is, three sides and three angles. So, classification of triangle is done on the base of these elements.



Triangles are classified in two ways:

(i) On the basis of sides and,

(ii) On the basis of angles.


According to Sides


1. Scalene Triangle:

A triangle in which all the three sides are unequal in length is called a scalene triangle.

AC > BC >AB

6 cm > 5 cm > 4.5 cm.



2. Isosceles Triangle:

A triangle in which two of its sides are equal is called isosceles triangle.

PQ = PR = 6 cm.



3. Equilateral Triangle:

A triangle in which have all its three sides equal in length is called an equilateral triangle.

LM = MN = NL = 5.5 cm




According to Angles


1. Acute Triangle:

A triangle which has all the three angles acute that is, less than 90°, is called an acute angled triangle or acute triangle.



2. Obtuse Triangle:

A triangle whose one angle is obtuse or more than 90° but less than 180° is called an obtuse angled triangle or obtuse triangle.



3. Right Triangle:

A triangle whose one angles is a right angle (that is 90°) is called a right angled triangle or right angle.





Related Links :



Triangle.

  • Classification of Triangle.
  • Properties of Triangle.
  • Worksheet on Triangle.
  • To Construct a Triangle whose Three Sides are given.
  • To Construct a Triangle when Two of its Sides and the
       included Angles are given.

  • To Construct a Triangle when Two of its Angles and the
       included Side are given.

  • To Construct a Right Triangle when its Hypotenuse and One
       Side are given.

  • Worksheet on Construction of Triangles.




  • 5th Grade Geometry

    5th Grade Math Problems

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