Question

@lowkey.s @chpatterson
Solve for pi: C = 2pir.
pi equals 2 times C over r
pi equals C over quantity 2 times r
pi equals C over r
pi equals r times C over 2

Answer 1

\[C= 2 \pi r \]
When wolving for a variable, you want to isolate it, so you apply the convenient operations in order to isolate the variable, and treat the rest as normal numbers.
Here, I would isolate that "r" by dividing both sides by "r".
\[\frac{ C }{ r }=\frac{ 2 \pi r }{ r } \rightarrow \frac{ C }{ r }=2 \pi \]

Answer 2

\[\pi=\frac{ C }{ R }\]