Question

What is the circumference of a circle with a radius of 1.875 cm.
What is the circumference to the hundredths place.
Use the `\pi`symbol on Desmos.

a. 11.79 centimeters
b. 44.18 centimeters
c. 12 centimeters
d. 11.78 centimeters

Answer 1

To find the circumference of a circle, you can use the formula:

\[
C = 2 \pi r
\]

where \( r \) is the radius of the circle. Given that the radius \( r = 1.875 \) cm, we can substitute this value into the formula:

\[
C = 2 \pi (1.875)
\]

Using the approximate value of \( \pi \approx 3.14 \), we calculate:

\[
C \approx 2 \times 3.14 \times 1.875 \approx 11.79 \text{ cm}
\]

To be more precise and calculate it to the hundredths place using the symbol for \(\pi\):

\[
C \approx 2 \cdot \pi \cdot 1.875 \approx 11.78 \text{ cm}
\]

So, rounding to the hundredths place, we find:

**The circumference is approximately 11.78 cm.**

Therefore, the correct answer is:

d. 11.78 centimeters.