Understanding the Two Formulas for Diameter of a Circle

Learn the two essential formulas for calculating the diameter of a circle, D = 2r and D = C/π.

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Two formulas for diameter: The first formula is D = 2r, where D is the diameter and r is the radius of a circle. The second formula is D = C/π, where D is the diameter, C is the circumference, and π (pi) is approximately 3.14159.

FAQs & Answers

  1. What is the formula for diameter in terms of radius? The formula is D = 2r, where D is the diameter and r is the radius of the circle.
  2. How can you calculate diameter using circumference? You can calculate diameter using the formula D = C/π, with C being the circumference and π approximately equal to 3.14159.
  3. Why is the diameter important in geometry? The diameter is crucial as it relates to other circle properties, such as radius, circumference, and area, making it essential for calculations in geometry.

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