Q: What size is the circumference of a circle if the diameter is 80?

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Diameter of a circle = circumference/pi

25.464

It has a circumference of 251.33 inches.

Diameter: Well, you said it yourself, 80 feet. Diameter is the distance across the widest part of a circle. Radius: The radius of a circle is half of the diameter, so in this case, it would be 40 feet. The radius is the distance from the center of the circle to the outside. Circumference: The formula for circumference is Pi (3.14 or 22/7) times the diameter. In this case, it would turn out to be 251.2 feet. Area: The formula for the area of a circle is Pi time the radius squared. So, you square the radius and multiply that by Pi (3.14). In this case, it would be 15775.36 feet squared. I hope I made sense. :)

you do 80 divided by 2 divided by (pie) 3.14 wich gives you the radius..and then times the radius by two..

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Diameter of a circle = circumference/pi

Diameter of a circle = circumference/pi

Circumference of a circle = π × diameter = π × 80 mm = 80π mm ≈ 251 mm

Diameter = 80/pi feet

The diameter is about 25.464 units.

25.464

It has a circumference of 251.33 inches.

80/pi = 25.465 cm (rounded)

divide it by three. that gets it close.

Circumference = Pi x d: 3.14 x 80 = 251.2 feet

If circumference = 160', and circumference = 2 x pi x r, then... 160 = 2 x pi x r 80 = pi x r 80/pi = r 2(80/pi) = diameter = 50.99'

Diameter: Well, you said it yourself, 80 feet. Diameter is the distance across the widest part of a circle. Radius: The radius of a circle is half of the diameter, so in this case, it would be 40 feet. The radius is the distance from the center of the circle to the outside. Circumference: The formula for circumference is Pi (3.14 or 22/7) times the diameter. In this case, it would turn out to be 251.2 feet. Area: The formula for the area of a circle is Pi time the radius squared. So, you square the radius and multiply that by Pi (3.14). In this case, it would be 15775.36 feet squared. I hope I made sense. :)