D-c/pie solve for pie

With a little algebraic manipulation we can solve for pi ...

d-c / pi

we want to get pi by itself so first we multiply both sides by pi to get it out of the denominator ...

pi * (d-c) = pi / pi

pi * (d-c) = 1

Now get pi by itself by dividing both sides by d-c ...

pi * (d-c) / d-c = 1 / d-c

simplify

pi * 1 = 1 / d-c

pi = 1 / d-c

Done!