Circle Radius Comparison: Finding the Ratio of 16 vs 8

To solve this problem, we will calculate the ratio of the radius of the red circle to the radius of the blue circle.

Here are the steps:

• Step 1: Identify the radii of the circles:
  Radius of the red circle is half of the diameter, $r_{\text{red}}=8$
  Radius of the blue circleis half of the diameter, $r_{\text{blue}}=4$

• Step 2: Use the formula for the ratio:
  $\text{Ratio}=\frac{r_{\text{red}}}{r_{\text{blue}}}=\frac{8}{4}$

• Step 3: Simplify the ratio:
  $\frac{16}{8} = 2$

Therefore, the radius of the red circle is twice the radius of the blue circle.

Therefore, the solution to the problem is $2$.