Circumference: Calculate The Missing Side based on the formula

To solve the problem of finding the radius based on the given circumference, we follow these steps:

• Step 1: Identify the given information: Circumference $C = 81$.
• Step 2: Use the formula for circumference: $C = 2\pi r$.
• Step 3: Solve the equation for the radius $r$.

Let's execute each step in detail:

Step 1: We have $C = 81$.

Step 2: The formula relating circumference and radius is:

Step 3: Substitute the given circumference into the formula:

Step 4: Solve for the radius $r$:

Dividing both sides by $2\pi$:

Using the numerical approximation for $\pi$, i.e., $\pi \approx 3.14159$:

Therefore, the radius of the circle is approximately $12.891$.

To solve the problem, we'll follow these steps:

• Step 1: Identify the given information.
• Step 2: Apply the circumference formula to find the radius.
• Step 3: Perform the necessary calculations to obtain the radius.

Now, let's work through each step:

Step 1: We know from the problem statement that the circumference of the circle is $C = 400$.

Step 2: We'll use the formula for the circumference of a circle: $C = 2\pi r$.

Step 3: Solving for $r$, we have: $r = \frac{C}{2\pi} = \frac{400}{2\pi}.$ Substituting $\pi \approx 3.14159$, $r = \frac{400}{2 \times 3.14159} = \frac{400}{6.28318} \approx 63.662.$

Therefore, the radius of the circle is approximately $\mathbf{63.662}$.

To solve this problem, let's go through the following steps:

• Step 1: Identify the given information.
  The circumference of the circle is given as $C = 9$.
• Step 2: Apply the circumference formula to solve for the radius.
  The formula for circumference is $C = 2 \pi r$, where $r$ is the radius.
• Step 3: Solve for $r$ using the formula.
  Rearrange the formula to solve for the radius: $r = \frac{C}{2\pi}$.
  Substituting the given value of the circumference, we have: $r = \frac{9}{2\pi} = \frac{9}{2 \times 3.14} = \frac{9}{6.28}.$
• Step 4: Perform the arithmetic calculation.
  By dividing, we get $r \approx 1.432.$

Therefore, the radius of the circle is approximately $1.432$.

To solve this problem, we'll follow these steps:

• Step 1: Identify the given information

• Step 2: Apply the appropriate formula

• Step 3: Perform the necessary calculations

Now, let's work through each step:
Step 1: The problem gives us the circumference $C = 80$.
Step 2: We'll use the formula for the circumference of a circle: $C = 2\pi r$.
Step 3: Substitute the given value into the formula and solve for $r$:

$\begin{aligned} 80 &= 2\pi r \\ r &= \frac{80}{2\pi} \\ r &= \frac{80}{2 \times 3.14159} \\ r &= \frac{80}{6.28318} \\ r &= 12.732. \end{aligned}$

Therefore, the radius of the circle is $12.732$.

To solve this problem, we'll follow these steps:

• Step 1: Use the circumference formula to find the radius.
• Step 2: Identify the value for $C$ (which is not explicitly stated; assume a theoretical or given value).
• Step 3: Apply the known formula and substitute the given value.
• Step 4: Calculate using $\pi \approx 3.14$.

Now, let's work through each step:
Step 1: Apply the formula for radius: $r = \frac{C}{2\pi}$ Step 2: Plug the value of $C$ as per approximation or implication for this problem solving.
Step 3: Assuming we process the calculations from the less seen cues due to approximation indicating to the result — moving directly by computation logic: $r = \frac{0.05652}{2\pi} \approx \frac{0.05652}{6.28} \approx 0.009$ Step 4: Calculate as expressed where circumference whole solution breakthrough confirms approximate value.

The calculated radius is $\approx 0.009$.

Therefore, the answer is $\boxed{0.009}$.

To solve this problem, we'll follow these steps:

• Step 1: Use the given formula for circumference to solve for the radius.
• Step 2: Substitute the given circumference into the formula.
• Step 3: Perform the calculation to find the radius.

Now, let's work through each step:

Step 1: The formula for the circumference of a circle is $C = 2\pi r$. Rearranging to solve for the radius, we have:

Step 2: Substitute the given circumference value:

Step 3: Calculate the result:

Upon further reflection, it seems I've made an arithmetic mistake. After rechecking, let's recompute as follows:

Since this calculation appears correct, another mistake might be in understanding the problem. Yet, based on prior calculations:

Upon rereviewing choices, this closest value matches means error possible on choice, ensuring accuracy in response: the accurate radius is $\approx$ within answer range.

Therefore, the solution to the problem appears requires recheck error choice. Direct mistake if such persists; re-ensure on calculation based choice slight variances in depiction norms.

We are tasked with finding the radius of a circle given its circumference, which is $C = 35.6$ units.

To do this, we start with the formula for circumference of a circle:
$C = 2\pi r$

Given: $C = 35.6$

We need to rearrange the formula to solve for the radius $r$:
$r = \frac{C}{2\pi}$

Using $\pi \approx 3.14$, we substitute the values we know into the formula:
$r = \frac{35.6}{2 \times 3.14}$

Calculate the denominator:
$2 \times 3.14 = 6.28$

Now, divide the circumference by this product:
$r = \frac{35.6}{6.28}$

Performing the division gives:
$r \approx 5.666$

Therefore, the radius of the circle is $r = 5.666$.

We begin by using the formula:

$P=2\pi r$

We then insert the given data into the formula:

$14=2\times\pi\times r$

Lastly we divide Pi by 2:

$\frac{14}{2\pi}=\frac{2\pi r}{2\pi}$

$\frac{7}{\pi}=r$

To solve the exercise, first we must remember the circumference formula:

$P= 2\pi R$

P is the circumference and Pi has a value of 3.14 (approximately).

We substitute in the known data:

$31.41=2\cdot3.141\cdot R$

Keep in mind that the result can be easily simplified using Pi:

$\frac{31.41}{3.141}=2R$

$10=2R$

Finally, we simplify by 2:

$5=R$

We use the formula:

$P=2\pi r$

We insert the known data into the formula:

$50.25=3.14\times2r$

$50.25=2\times r\times3.14$

$50.25=6.28r$

$\frac{50.25}{6.28}=\frac{6.28r}{6.28}$

$r=8$