Formula for diameter of a circle

In summary, the formula for finding the diameter of a circle is d = 2r, where d is the diameter and r is the radius. You can also calculate the diameter if you only know the circumference by using the formula d = c / pi, and if you only know the area, you can use the formula d = 2 * √(A / pi). The diameter and radius of a circle are directly related, with the diameter always being twice the length of the radius. This relationship applies to all circles, making the formula for the diameter of a circle the same for all circles regardless of their size or shape.
  • #1
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How do you get the diameter of a circle from the area alone? Can this be done?
 
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  • #2
Sure. [tex]d = 2\sqrt{\frac{A}{\pi}}[/tex] where d is the diameter and A is the area.
 
  • #3
excellent! thank you Curious
 

What is the formula for finding the diameter of a circle?

The formula for finding the diameter of a circle is d = 2r, where d is the diameter and r is the radius.

How do you calculate the diameter of a circle if you only know the circumference?

You can calculate the diameter of a circle if you only know the circumference by using the formula d = c / pi, where d is the diameter, c is the circumference, and pi is a constant with a value of approximately 3.14.

Can you find the diameter of a circle with just the area?

Yes, you can find the diameter of a circle with just the area by using the formula d = 2 * √(A / pi), where d is the diameter, A is the area, and pi is a constant with a value of approximately 3.14.

What is the relationship between the diameter and radius of a circle?

The diameter and radius of a circle are directly related, meaning they are proportional to each other. This means that the diameter is always twice the length of the radius.

Is the formula for the diameter of a circle the same for all circles?

Yes, the formula for the diameter of a circle is the same for all circles, regardless of their size or shape. It is a fundamental mathematical relationship that applies to all circles.

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