Question

Find the circumference of each circle, both in terms of pi and to the nearest tenth. Use 3.14 for pi.

1. circle with diameter 4 m a. 25.1m
2. circle with radius 9 m b. 12.6m
3. circle with radius 4 m c. 9.4m
4. circle with radius 5.5 m d.56.5m
5. circle with diameter 3 m e. 34.5m
f. 25.7m

Answer 1

To find the circumference of a circle, use the formula C = 2πr. Calculate the circumference for each given circle in terms of pi and to the nearest tenth.

Step-by-step explanation:

To find the circumference of a circle, you can use the formula C = 2πr, where r is the radius of the circle. Let's calculate the circumference for each circle:

1. Circle with diameter 4m: Radius = diameter / 2 = 4m / 2 = 2m. Circumference = 2π(2m) = 4πm ≈ 12.6m.
2. Circle with radius 9m: Circumference = 2π(9m) = 18πm ≈ 56.5m.
3. Circle with radius 4m: Circumference = 2π(4m) = 8πm ≈ 25.1m.
4. Circle with radius 5.5m: Circumference = 2π(5.5m) = 11πm ≈ 34.5m.
5. Circle with diameter 3m: Radius = diameter / 2 = 3m / 2 = 1.5m. Circumference = 2π(1.5m) = 3πm ≈ 9.4m.