Question

The ratio of circumference of circle with radius r to its area find the ratio

Answer 1

circumference of circle:area of circle
2×pi×r:pi×r^2
2×pi×r/pi×r^2
therefore, the ratio is 2:r

Answer 2

Answer:

Ratio of circumference to its area = 2 : r

Step-by-step explanation:

Circumference of the circle :

$C = 2 \pi r$

Area of the circle :

$A = \pi r^2$

We have to find the  ratio of circumference to its area  

that is C : A

So,

$C : A = 2 \pi r : \pi r^2$

after cancellation of $\pi$ and r we are left with

$C : A = 2 : r$

So, ratio of circumference to its area = 2 : r