The diameter of the disk is 4.5 inches, so the radius \( r \) is half of that:
\[ r = \frac{4.5}{2} = 2.25 \text{ inches} \]
The circumference \( C \) of a circle is given by:
\[ C = 2 \pi r \]
Substitute \( r = 2.25 \) inches:
\[ C = 2 \pi \times 2.25 \approx
Show more…