Four triangles are formed by joining the mid points of three sides of a triangle. 

(i) Two triangles are congruent 

(ii) Three triangles are congruent 

(iii) All the triangles are congruent 

(iv) None are congruent 

(a) (i) is correct 

(b) (ii) is correct 

(c) (iii) is correct 

(d) (iv) is correct

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