How to Calculate the Diameter of a Circle: Formula Explained

Learn the simple formulas to calculate the diameter of a circle using its radius or circumference.

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The formula for calculating the diameter of a circle is D = 2r, where D symbolizes the diameter and r represents the radius. Alternatively, if you know the circumference, you can use D = C / π, where C is the circumference and π (pi) is approximately 3.14159.

FAQs & Answers

  1. What is the relationship between diameter and radius? The diameter of a circle is always twice the length of the radius, represented by the formula D = 2r.
  2. Can I calculate the diameter if I only have the circumference? Yes, you can use the formula D = C / π to find the diameter from the circumference.
  3. What does π represent in circle formulas? π (pi) is a mathematical constant approximately equal to 3.14159, used in calculations involving circles.
  4. How do I find the radius if I know the diameter? To find the radius, divide the diameter by two using the formula r = D / 2.

Watch More

For more insightful videos on geometry and mathematical concepts, check out our related content on calculating areas and circumferences of circles.

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  2. How to Calculate the Diameter of a Circle: Easy Formula Explained Learn the simple formulas to find the diameter of a circle using radius or circumference.
  3. Understanding the Circumference of a Circle: Key Formulas Explained Learn the essential formulas to calculate the circumference of a circle using radius and diameter.