Final answer:
The diameter of a circle is twice the length of its radius. So, if the radius is 5 mm, the diameter is 10 mm.
Step-by-step explanation:
The concept here is about how the radius and diameter of a circle relate to each other. In a circle, the diameter is simply twice the length of the radius. That is, Diameter = 2 * Radius.
So, if the radius of the circle is given as 5 mm, the diameter of the circle can be calculated by the formula: Diameter = 2 * Radius
Substituting the given radius into the formula, we get: Diameter = 2 * 5 mm = 10 mm.
So, the diameter of the circle is 10 mm.
Learn more about Circle Diameter