Question

Given a circle with a radius of 4, which is the circumference?

Answer 1

\[C=2 \pi r\]

Answer 2

i suggest you memorize this equation

Answer 3

thanks very muuch

Answer 4

also these are important
area of circle
\[A= \pi r^2\]

and if you didnt know this already

diameter = 2 * radius
\[d=2r\]