Question

The radius of a circle is 2.5
centimeters (cm).

What is the circumference of the circle?

Responses

1.25π
cm
1.25π
cm

2.5π
cm
2.5π
cm

5π
cm
5π
cm

5
cm

Answer 1

The formula for the circumference \( C \) of a circle is given by:

\[
C = 2\pi r
\]

where \( r \) is the radius of the circle.

Substituting the radius \( r = 2.5 \) cm into the formula:

\[
C = 2\pi (2.5) = 5\pi \, \text{cm}
\]

Therefore, the circumference of the circle is:

\(\mathbf{5\pi \, cm}\)