If three corresponding sides of one triangle are proportional to three sides of another, then the triangles are similar. always sometimes never

If all 3 sides are proportional, then they are always similar. 

The definition of similar triangles is that they are proportional on all sides and angles. 

If three corresponding sides of one triangle are proportional to three sides of another, then the triangles are similar 'Always'.

As, we know that the two triangle are only similar when there corresponding sides is equal to one another. (This is the definition of similar triangle.)

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for