Pi is a quantity, a value that is independent of the way you represent it in symbols. Base 8 is simply a different way of representing a given value, in the sa

Pi is a quantity, a value that is independent of the way you represent it in symbols. Base 8 is simply a different way of representing a given value, in the same way that 4/6 and 6/9 are two different ways of representing the same value. In the case of 4/6 and 6/9 there is an agreed canonical way of designating that value, namely 2/3. In the case of pi there is similarly an agreed canonical way of designating the value, namely the symbol π.