How to Find the Unknown Radius of a Circle | Step-by-Step Guide

Learn how to calculate the unknown radius of a circle using circumference or area formulas with clear examples.

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To find an unknown radius of a circle, use the formula r = C / (2π) if the circumference (C) is known, or r = √(A / π) if the area (A) is known. Substitute your given value into the appropriate formula and solve for r.

FAQs & Answers

  1. What is the formula to find the radius from circumference? The formula to find the radius from the circumference is r = C / (2π), where C is the circumference.
  2. How can I calculate the radius from the area of a circle? To calculate the radius from the area, use the formula r = √(A / π), where A is the area of the circle.
  3. What is the significance of the radius in circle geometry? The radius is a crucial dimension in circle geometry, defining the size and circumference, as well as the relationships with diameter and area.

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