Radius of the circle can be obtained through different formulas. I will show you how to get it from Circumference and Area of the circle. We know that radius r equals to diameter divided by 2.
First we must be familiar with those two formulas.
We know that Area of circle is [tex]A=\pi r^2[/tex] where r is our radius. We can solve the equation for r using operations on both sides of the equation hence,
[tex]A=\pi r^2\\A/\pi =(\pi r^2)/\pi \\r^2=A/\pi\\\boxed{r=\sqrt{A/\pi}}[/tex]
We also know that Circumference C of circle is [tex]C=2\pi r[/tex] where again r is our radius. And again solve for r.
[tex]C=2\pi r\\C/2\pi = 2\pi r/2\pi\\\boxed{r=C/2\pi}\\[/tex]
Hope this helps.
r3t40
