Circumference for ninth grade: Calculate by how much the perimeter has increased

The length of the radius of a circle is given in the diagram below.

Calculate how many times its circumference is greater than the length of its radius.

$2\pi$

In the circle of the drawing, the radius and the circumference are given. Calculate how many times greater the circumference is than the diameter's length?

3.14

The diameter of a circle is given in the figure below.

Calculate how many times greater the circumference is than the length of the diameter?

$\pi$

The length of the diameter and the circumference of a circle are given below.

Calculate how many times greater the circumference is than the length of the radius?

6.28

The measurements of the diameter and circumference of a circle are shown in the figure below.

Calculate how many times greater the circumference is than the length of the radius?

6.28