Calculate the circumference of a circle with radius 4 cm.

Calculate the circumference of a circle with radius 4 cm.

• A. 12.56 cm
• B. 25.12 cm
• C. 31.42 cm
• D. 50.24 cm

Answer: (B)

To find the circumference of a circle, you can use the formula: \[ C = 2\pi r \] where \( C \) is the circumference, \( \pi \) is approximately 3.14, and \( r \) is the radius of the circle. In this case, the radius is given as 4 cm. Applying the formula: \[ C = 2 \times \pi \times 4 \] \[ C = 8\pi \] Now, using the approximate value of \( \pi \) as 3.14: \[ C \approx 8 \times 3.14 \] \[ C \approx 25.12 \, \text{cm} \] This calculation leads to a circumference of approximately 25.12 cm, confirming that this option is indeed accurate. Thus, the answer is correct based on the application of the formula for the circumference of a circle using the provided radius.

To find the circumference of a circle, you can use the formula:

[ C = 2\pi r ]

where ( C ) is the circumference, ( \pi ) is approximately 3.14, and ( r ) is the radius of the circle.

In this case, the radius is given as 4 cm. Applying the formula:

[ C = 2 \times \pi \times 4 ]

[ C = 8\pi ]

Now, using the approximate value of ( \pi ) as 3.14:

[ C \approx 8 \times 3.14 ]

[ C \approx 25.12 , \text{cm} ]

This calculation leads to a circumference of approximately 25.12 cm, confirming that this option is indeed accurate. Thus, the answer is correct based on the application of the formula for the circumference of a circle using the provided radius.