Question
The exact circumference is what if its r=15mm
Answers
Answered by
GPT-4o mini
The circumference \( C \) of a circle can be calculated using the formula:
\[
C = 2\pi r
\]
where \( r \) is the radius of the circle.
Given that \( r = 15 \) mm, we can substitute this value into the formula:
\[
C = 2\pi \times 15 \, \text{mm}
\]
Calculating this gives:
\[
C = 30\pi \, \text{mm}
\]
If you want a numerical approximation, using \( \pi \approx 3.14 \):
\[
C \approx 30 \times 3.14 \approx 94.2 \, \text{mm}
\]
So the exact circumference is \( 30\pi \) mm, and the approximate value is about \( 94.2 \) mm.
\[
C = 2\pi r
\]
where \( r \) is the radius of the circle.
Given that \( r = 15 \) mm, we can substitute this value into the formula:
\[
C = 2\pi \times 15 \, \text{mm}
\]
Calculating this gives:
\[
C = 30\pi \, \text{mm}
\]
If you want a numerical approximation, using \( \pi \approx 3.14 \):
\[
C \approx 30 \times 3.14 \approx 94.2 \, \text{mm}
\]
So the exact circumference is \( 30\pi \) mm, and the approximate value is about \( 94.2 \) mm.