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

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

• A. 21.98 inches
• B. 43.96 inches
• C. 49.00 inches
• D. 18.36 inches

Answer: (B)

To find the circumference of a circle, you can use the formula \( C = 2\pi r \), where \( C \) is the circumference and \( r \) is the radius of the circle. Given that the radius is 7 inches, you can substitute this value into the formula. Using the approximate value of \( \pi \) as 3.14, you calculate as follows: 1. First, calculate \( 2r \): \( 2 \times 7 = 14 \) inches. 2. Next, multiply this result by \( \pi \): \( 14 \times 3.14 = 43.96 \) inches. Thus, the circumference of the circle is 43.96 inches, making this the correct answer. Understanding this calculation is crucial because it demonstrates how geometry and constants like pi play a vital role in solving problems related to circles.

To find the circumference of a circle, you can use the formula ( C = 2\pi r ), where ( C ) is the circumference and ( r ) is the radius of the circle. Given that the radius is 7 inches, you can substitute this value into the formula.

Using the approximate value of ( \pi ) as 3.14, you calculate as follows:

1. First, calculate ( 2r ):

( 2 \times 7 = 14 ) inches.

2. Next, multiply this result by ( \pi ):

( 14 \times 3.14 = 43.96 ) inches.

Thus, the circumference of the circle is 43.96 inches, making this the correct answer. Understanding this calculation is crucial because it demonstrates how geometry and constants like pi play a vital role in solving problems related to circles.