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2.    With respect to sides are:
    (a)     Scalene triangles     (b)     Isosceles triangles     (c)     Equilateral triangles

    (a)     Scalene Triangle: A triangle in which no two sides are equal in length is called a scalene triangle.
        •     Length of all sides and measurement of all angles is different.

    (b)     Isosceles Triangle    

        (i)     Two sides have same length 
        (ii)     The angles opposite to the equal sides are equal.
        If in DABC, AB  = AC then B = C this is an isoceles triangle.
        Converse is also true 
        If in a triangle two angles are equal then sides opposite to equal angles are equal in length.
        In , if B = C then AB = AC.

(c)     Equilateral Triangle  
        In an equilateral triangle
        (i)     All sides are equal in length.
        (ii)     Measurement of each angle is 60°.            
        In , if AB = BC = AC then  ∠A = ∠B =∠C = 60°
        or if  then ∠A = ∠B = ∠C= 60° AB = BC = AC

 

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