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The short answer is that all circles are geometrically similar. Ignoring the circle's position, you need a single number to characterize the circle.

The idea is that the diameter of the circle is always 2 times the radius, the circumference is equal to the radius times 2 times pi, and the area is calculated as pi times radius squared.

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Q: Why do you only need one of the radius diametercircumference or an area of a circle to figure out all of the others?
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Related questions

How do you figure length of a radius?

The radius of a circle is half of its diameter


What is a radius square?

When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.


How does a congruent figure look like?

A congruent figure is identical to another figure. Example would be like a circle with the radius of 12 meters, then the congruent figure would have to be a circle with a 12 meter radius.


How do you figure out the diameter of a circle?

Pi times the radius of the circle squared = area And diameter is simply the radius x 2, since the radius is half the length of the circle.


How do you figure out the radius of a circle?

You can divide the diameter by two.


How do you figure the radius of a circle?

You take out your ruler and measure it.


How do you figure pi radius of a circle?

The area of any circle = pi*radius2


How do you change area of a circle into radius?

Figure out the square root


How do you figure out area of a circle?

pi times radius squared. :)


How to get the area of a circle?

Figure out its radius and multiply it by pi or 3.14.


What is the circumference if the radius is 10?

The circumference is 42.83 becausecircumference = 2 x pi x r2 x 2.1415927 x 10 = 42.83Improved answer:Circumference of a circle = 2*pi*radius or pi*diameterCircumference = 20*pi = 62.83185307 units or 63 to the nearest unit.


What is the circumference of a circle if it's diameter is 7 inches to 1 decimal place?

The circumference is equal to r2*pie or 38.5 inchesAnother answer:Circumference of a circle = 2*pi*radius or pi*diameterCircumference = 7*pi = 21.99114858 or 22.0 inches to one decimal place.