That's presumably the idea, and it's quite a common 'tool' that is used.
However, I've often wondered whether it is actually doing people an (educational) service by providing them with such 'tools'. Given an equation as simple as:
X = Y x Z
...it requires only an understanding of the most trivial and basic concepts of algebra to be able to re-arrange it in the other two possible ways (to put Y or Z on the left-hand side) - and the great advantage of learning 'how to do it oneself' is that one can then apply that knowledge to much more complicated equations.
The 'triangles' are a sort of 'cook-book' approach - an approach which (at least in my opinion) rarely has a lot to be said for it.
My reply was an or the answer to Bernard's question:
Why have these confusing triangles ?
Keep it simple Amps = Volts divided by Ohms