In each of the examples given below, a pair of triangles is shown. Equal parts of triangles in each pair are marked with the same signs. Observe the figures and state the test by which the triangles in each pair are congruent.
(i)
By . . . . . . . . . . test
ABC PQR
(ii)
By . . . . . . . . . . test
XYZ
LMN
(iii)
By . . . . . . . . . . test
LMN
PTR
(iv)
By . . . . . . . . . . test
LMN
PTR