Question

write the S.S.S criterion for similarity of triangles

Answer 1

if in 2 triangle side of One triangle are proportional to the sides of the Other triangle then their corresponding angles are equal and hence the two Triangles are similar.

Answer 2

If in two triangles, the ratios of one side of one triangle to one side of the other triangle are equal then the triangles are said to be similar.
For example in ∆ABC and ∆PQR,
If AB/PQ=BC/QR=AC/PR
THEN THE TWO TRIANGLES ARE SIMILAR