Question

The radius of a circle is 12.25 centimeters. What is the circumference of the circle?

Answer 1

`\Longrightarrow: \boxed{\sf{76.93cm}}`

Explanation:

This problem must be solved using the circumference of the circle formula.

Circumference of the circle formula:

`\Longrightarrow:\sf{C=2*\pi r}`

• C=???
• π=3.14
• R=12.25

`\Longrightarrow: \sf{2*3.14*12.25}`

Solve.

Multiply the numbers from left to right.

Use the order of operations.

PEMDAS stands for:

• Parentheses
• Exponents
• Multiply
• Divide
• Add
• Subtract

`\sf{2*3.14*12.25}\\\\\sf{2*3.14=6.28}\\\\\sf{6.28*12.25=\boxed{\sf{76.93}}`

• Therefore, the correct answer is 76.93cm.

I hope this helps! Let me know if you have any questions.

Answer 2

With a given radius you can multiply by 2 and simply get the diameter. Getting the diameter of the circle would then allow you to use the equation pi(24.5). You can round pi to 3.14. 3.14*24.5=76.93. The circumference is 76.93.