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.

$2\pi$

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

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 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

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?

$\pi$