How to Calculate the Diameter of a Circle: Simple Steps

Learn how to easily calculate the diameter of a circle using the radius or circumference with straightforward formulas.

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To figure the diameter of a circle, multiply the radius by 2. If you only have the circumference (C), divide it by π (pi, approximately 3.14159). The formula is: Diameter (D) = 2 × Radius (R) or D = C/π. These straightforward calculations will give you an accurate measurement of the circle's diameter.

FAQs & Answers

  1. What is the formula for diameter? The diameter (D) can be calculated using the formula D = 2 × Radius (R) or D = Circumference (C) ÷ π.
  2. How do you find the radius if you only have the diameter? To find the radius, divide the diameter by 2: Radius (R) = Diameter (D) ÷ 2.
  3. What is the relationship between diameter and circumference? The circumference (C) of a circle can be calculated using the formula C = π × Diameter (D).

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For more insightful tips on geometry and calculations, check out our videos on related topics, including area and circumference of circles.

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