if substitute r = 5 into c = 2 pi r then the result to 2 decimal places is

To solve for \( c \) when \( r = 5 \) in the equation \( c = 2 \pi r \):

1. Substitute \( r = 5 \) into the equation:

\[
c = 2 \pi \times 5
\]

2. Calculate:

\[
c = 10 \pi
\]

Using \( \pi \approx 3.1416 \):

\[
c = 10 \times 3.1416 = 31.416
\]

Rounding to 2 decimal places:

\[
c \approx 31.42
\]

So, the result is \( c = 31.42 \).

Would you like more details on this, or have any questions?

Here are 5 related questions:
1. How would the result change if \( r = 10 \)?
2. What is the circumference formula for a circle?
3. Can you derive the formula \( c = 2 \pi r \)?
4. How is the value of \( \pi \) determined?
5. How does the circumference relate to the diameter of a circle?

**Tip:** Always keep \( \pi \) in your calculations until the final step to avoid rounding errors!

Learn how to calculate the circumference of a circle using the formula c = 2πr when the radius is 5. This detailed guide provides a step-by-step solution and rounds the result to 2 decimal places. Suitable for students in Grades 6-8.

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