If the radius of a circle is 7 cm, what is its circumference? (Use π ≈ 3.14)

• A. 43.96 cm
• B. 44.0 cm
• C. 45.0 cm
• D. 46.0 cm

Answer: (A)

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

[ \text{Circumference} = 2\pi r ]

where ( r ) is the radius of the circle. Given that the radius is 7 cm and using ( \pi \approx 3.14 ), you can substitute these values into the formula:

[ \text{Circumference} = 2 \times 3.14 \times 7 ]

Performing the multiplication step by step, first calculate:

[ 2 \times 3.14 = 6.28 ]

Next, multiply this result by the radius (7 cm):

[ 6.28 \times 7 = 43.96 ]

Therefore, the circumference of the circle is 43.96 cm. This aligns with the first choice.

Understanding this formula helps in calculating the circumference of any circle, as it directly relates the radius to the total distance around the circle.