Question

What is the diameter of a circle whose circumference is 5?

1) 2.5/pi squared
2) 2.5/pi
3) 5/pi squared
4) 5/pi

Answer 1

`Circumference\ of\ the\ circle:\\\\ C=2 \pi r\ \ , r-radius\\\\ 5=2 \pi r\ \ \ |:2 \pi \\\\ (5)/(2 \pi )=r\\\\ r=(2,5)/( \pi) \\\\Answer\ is\ 2)\ (2,5)/( \pi).`