Find the circumference of a circle that has a radius of 7 cm. Use 3.14 for π.

Understand the Problem

The question is asking to calculate the circumference of a circle using the formula C = 2πr, where r is the radius of the circle. In this case, the radius is given as 7 cm and π is approximated as 3.14.

Answer

$43.96 \text{ cm}$

Steps to Solve

Identify the formula for circumference

The formula to calculate the circumference $C$ of a circle is given by

$$ C = 2\pi r $$

where $r$ is the radius.

Substitute the values into the formula

Here, the radius $r$ is given as 7 cm. Substituting this value and using $\pi \approx 3.14$, the equation becomes:

$$ C = 2 \times 3.14 \times 7 $$

Perform the multiplication

Now, calculate:

First, multiply $2$ and $3.14$:

$$ 2 \times 3.14 = 6.28 $$

Next, multiply this result by the radius:

$$ C = 6.28 \times 7 $$

Calculate the final result

Finally, perform the multiplication:

$$ C = 6.28 \times 7 = 43.96 $$

So, the circumference of the circle is

$$ C = 43.96 \text{ cm} $$

The circumference of the circle is $43.96 \text{ cm}$.

More Information

This calculation helps determine how far it is around the circle, which can be useful in various practical situations, such as construction, decoration, and design.

Tips

Forgetting to use the correct value of π: Always ensure that the value of π provided in the problem is used correctly.
Mistakes in multiplication: Keep track of the order of operations, and double-check your multiplication.

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