Question

a
radius =
diameter = c=

Explanation:

Step1: Find the radius

The radius is given as \(5\) mm.

Step2: Calculate the diameter

The formula for the diameter \(d\) of a circle is \(d = 2r\), where \(r\) is the radius.
Substituting \(r = 5\) mm, we get \(d=2\times5 = 10\) mm.

Step3: Calculate the circumference

The formula for the circumference \(C\) of a circle is \(C = 2\pi r\) or \(C=\pi d\). Using \(r = 5\) mm and \(\pi\approx3.14\), we have \(C = 2\times3.14\times5=31.4\) mm.

Answer:

radius \(= 5\) mm, diameter \(= 10\) mm, \(C = 31.4\) mm