How to Accurately Measure a Circle Using a Ruler

Learn to measure a circle's diameter and find its circumference using simple steps and a ruler.

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To measure a circle with a ruler, follow these steps: 1. Measure the diameter by placing the ruler across the widest part of the circle. 2. Divide this measurement by 2 to get the radius. 3. Use the formula C = 2πr (where C is the circumference and r is the radius) for finding the circumference if needed.

FAQs & Answers

  1. What is the formula for circumference of a circle? The formula for circumference is C = 2πr, where r is the radius of the circle.
  2. How do you find the radius from the diameter? To find the radius, divide the diameter by 2.
  3. Can I measure a circle without a ruler? Yes, you can use a piece of string to measure the diameter and then measure the string with a ruler.
  4. What tools can I use to measure a circle? You can use a ruler, measuring tape, or a compass to measure a circle.