# Answer to Question #32654 in Geometry for Don

Question #32654

I need to make a circle by only knowing the circumference has to be only of inches, for example I need a circle that has a circumference of exactly 200 inches, how might I figure this out?

Expert's answer

Thecircumference of a circle is the edge or rim of a circle itself. It is the

equivalent of 'perimeter' for a circle. In other words, if you took a circle

and unrolled it, you would have its circumference. You can use either of the

formulas below to find the circumference . One formula use the radius of a circle;

the other formula uses the diameter.

Formula using Diameter

Circumference=π⋅diamete

Formula using Radius

Circumference=2π⋅radius

These two formulas are just two different ways of finding the same thing

(circumference) because the diameter of a circle =2• radius. So you can use

whichever formula is more convenient. If you know a circle's radius, use the

first version of the formula; if you know the diameter, use the second.

Example:

Circumference=2π⋅radius

200 = 2 * 3.14 * radius

radius = 200/6.28 = 31.84 inches

The Radius is the distance from the center to the edge.

So now, a circle is easy to make:

Draw a curve that is "radius" away from a central point.

And so:

All points are the same distance from the center.

equivalent of 'perimeter' for a circle. In other words, if you took a circle

and unrolled it, you would have its circumference. You can use either of the

formulas below to find the circumference . One formula use the radius of a circle;

the other formula uses the diameter.

Formula using Diameter

Circumference=π⋅diamete

Formula using Radius

Circumference=2π⋅radius

These two formulas are just two different ways of finding the same thing

(circumference) because the diameter of a circle =2• radius. So you can use

whichever formula is more convenient. If you know a circle's radius, use the

first version of the formula; if you know the diameter, use the second.

Example:

Circumference=2π⋅radius

200 = 2 * 3.14 * radius

radius = 200/6.28 = 31.84 inches

The Radius is the distance from the center to the edge.

So now, a circle is easy to make:

Draw a curve that is "radius" away from a central point.

And so:

All points are the same distance from the center.

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