Question

Is a=2π a circumference of a circle or area of circle

Answer 1

The circumference of a circle is given by:

`\begin{gathered} C=2\pi r \\ where\colon \\ r=radius \\ or \\ Since \\ d=diameter=2r \\ C=\pi d \end{gathered}`

And the area is:

`\begin{gathered} A=\pi r^2 \\ or \\ A=\pi((d)/(2))^2 \end{gathered}`