How to Use Radius and Diameter in Circle Calculations?

Learn how to effectively use radius and diameter for circle area and properties calculations in geometry.

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To calculate properties related to a circle, you use either the radius or the diameter depending on the formula. For instance, the area (A) of a circle uses the radius (r) with the formula A = πr². However, the diameter (d) is simply twice the radius: d = 2r.

FAQs & Answers

  1. What is the formula for the area of a circle? The area of a circle is calculated using the formula A = πr², where r is the radius.
  2. How do you convert diameter to radius? To convert diameter to radius, you simply divide the diameter by 2: r = d/2.
  3. Which is more important, radius or diameter? Both radius and diameter are crucial in circle calculations; use radius for area and diameter for some other measurements.

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