How square feet in a yard ofg concretE?

Answer 1

It is common to order or quote ready-mix concrete as a number of yards. But what is really meant is the number of cubicyards. If this is what you mean, then there is no answer to your question because the number of square feet you'd get from a cubic yard will depend on how thickly you spread it.

But if you mean how many square feet in a square yard then there are 9, whether it's concrete or anything else.