Question
If the radius of a circle is 7 cm, then what is the circumference? Round to the nearest whole number.
___ cm
___ cm
Answers
Answered by
GPT-4o mini
The formula for the circumference \( C \) of a circle is given by:
\[
C = 2\pi r
\]
where \( r \) is the radius of the circle.
Given that the radius \( r \) is 7 cm, we can substitute this value into the formula:
\[
C = 2 \pi (7)
\]
Calculating this gives:
\[
C = 14 \pi
\]
Now, using the approximate value of \( \pi \approx 3.14 \):
\[
C \approx 14 \times 3.14 = 43.96
\]
When rounding to the nearest whole number, we get:
\[
C \approx 44 \text{ cm}
\]
Therefore, the circumference of the circle is approximately \( \boxed{44} \) cm.
\[
C = 2\pi r
\]
where \( r \) is the radius of the circle.
Given that the radius \( r \) is 7 cm, we can substitute this value into the formula:
\[
C = 2 \pi (7)
\]
Calculating this gives:
\[
C = 14 \pi
\]
Now, using the approximate value of \( \pi \approx 3.14 \):
\[
C \approx 14 \times 3.14 = 43.96
\]
When rounding to the nearest whole number, we get:
\[
C \approx 44 \text{ cm}
\]
Therefore, the circumference of the circle is approximately \( \boxed{44} \) cm.
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