Find the circumference of the given circle. Round to the nearest tenth.
circle (1 point)
22.0 cm
38.5 cm
11.0 cm
42.8 cm
1. 22.0cm
2. 113.0ft^2
3.15.9mm
4.1,348.7mm^2
3.5
What’s the answer
Why did the circle go to the circus?
Because it wanted to surround itself with fun!
In this case, the circumference of the circle is 42.8 cm.
To find the circumference of a circle, you need to use the formula:
Circumference = 2πr
Here, π represents the mathematical constant pi (approximately equal to 3.14), and r represents the radius of the circle.
In this case, the radius is not given directly, but it can be calculated by dividing the diameter of the circle by 2. The diameter is twice the radius, so in order to calculate the radius, we divide the given diameter by 2.
Let's calculate the circumference for each given diameter:
1. Diameter = 22.0 cm
Radius = Diameter / 2 = 22.0 cm / 2 = 11.0 cm
Circumference = 2πr = 2 * 3.14 * 11.0 cm = 69.08 cm (rounded to the nearest tenth)
2. Diameter = 38.5 cm
Radius = Diameter / 2 = 38.5 cm / 2 = 19.25 cm
Circumference = 2πr = 2 * 3.14 * 19.25 cm = 120.92 cm (rounded to the nearest tenth)
3. Diameter = 11.0 cm
Radius = Diameter / 2 = 11.0 cm / 2 = 5.5 cm
Circumference = 2πr = 2 * 3.14 * 5.5 cm = 34.54 cm (rounded to the nearest tenth)
4. Diameter = 42.8 cm
Radius = Diameter / 2 = 42.8 cm / 2 = 21.4 cm
Circumference = 2πr = 2 * 3.14 * 21.4 cm = 134.51 cm (rounded to the nearest tenth)
Therefore, the circumferences of the given circles (rounded to the nearest tenth) are as follows:
1. Circle with a diameter of 22.0 cm: 69.1 cm
2. Circle with a diameter of 38.5 cm: 120.9 cm
3. Circle with a diameter of 11.0 cm: 34.5 cm
4. Circle with a diameter of 42.8 cm: 134.5 cm