Hi Im a bit confused with the following
how do I rearrange the equation below so I can calculate the value of d
All the values which are in the denominator are multiplied to bring it to other side and all values which are in the numerator are divided to bring it to the other side. Do this for all values except $\displaystyle d$.
$\displaystyle G = \sigma \frac{\pi d^2}{4D}$
Multiplying by $\displaystyle 4D$ and divide by $\displaystyle \sigma \pi$ each side to obtain:
$\displaystyle \frac{4DG}{\pi \sigma} = d^2$
Square root both side to obtain $\displaystyle d$ on its own as a subject.
$\displaystyle d = \sqrt{\frac{4DG}{\pi \sigma}}$