Question

What is the radius and diameter of the following circle:16 cmRadiuscmDiametercm

Answer 1

In the picture they are showing you that the radius is

$r=16\operatorname{cm}$

and we know that the diameter is:

$\begin{gathered} D=2r \\ D=2(16) \\ D=32\operatorname{cm} \end{gathered}$