Q&A for How to Work Out the Circumference of a Circle

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A bicycle wheel has a radius of 56 cm. How do I calculate the distance the wheel travels in five complete revolutions?

Donagan

Top Answerer

Double the radius. That's the diameter. Multiply the diameter by pi. That's the circumference. Multiply the circumference by five. That's how far the wheel travels in five revolutions.

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What length of rope would I need to make a one-meter circle?

Donagan

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Assuming the diameter of the circle is to be one meter, multiply the diameter by pi. That means the rope would have to be 3.14 meters long.

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A semicircle has radius 6 cm. What's its total perimeter?

Donagan

Top Answerer

The total perimeter is the diameter (twice the radius) plus half the circumference of the full circle. So it's 12 + (12π / 2) = 12 + 6π = 30.85 cm.

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How do I work out the diameter if given the circumference?

Donagan

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Divide the circumference by pi.

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Question

I want to know what the circumference is of my septic tank is. The problem is, only about 20 inches of the curvature is exposed, the rest being covered by soil. What can I do?

Donagan

Top Answerer

Assuming you cannot expose the remainder of the tank's rim, you can come up with an approximate circumference by inscribing in the soil a circle based on the exposed curvature. Then use a yardstick or other long straightedge to run along the circle to measure its length.

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