Calculate Circle Circumference with Radius 8.7: Step-by-Step Solution

r=8.7 r=8.7


Calculate the circumference.

8.78.78.7

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Calculate the circle's circumference
00:03 We'll use the formula to calculate the circle's circumference
00:07 We'll substitute the given radius and solve for the circumference
00:11 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

r=8.7 r=8.7


Calculate the circumference.

8.78.78.7

2

Step-by-step solution

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: We are given the radius of the circle r=8.7 r = 8.7 .

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

Step 3: Plugging in our value for the radius, we calculate:
C=2π(8.7) C = 2 \pi (8.7)

Using π3.14159 \pi \approx 3.14159 , the expression becomes:
C=2×3.14159×8.7 C = 2 \times 3.14159 \times 8.7

Performing the multiplication, we get:
C54.664 C \approx 54.664

Therefore, the circumference of the circle is approximately 54.664 54.664 .

This matches the answer choice : 54.664

, confirming its correctness.

3

Final Answer

54.664

Practice Quiz

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\( r=2 \)

Calculate the circumference.

222

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