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  1. www.omnicalculator.com › math › radius-of-a-circleRadius of a Circle Calculator

    6 dni temu · There are three circle radius formulas, depending on what number you know: The radius of a circle from the area: if you know the area A, the radius is r = √(A / π). The radius of a circle from circumference: if you know the circumference c, the radius is r = c / (2 × π).

  2. www.omnicalculator.com › math › circleCircle Calculator

    3 dni temu · If you know the radius or diameter of the circle, the area of the circle formula is: a = πr² = π × (d / 2)². If radius and diameter are unknown, you can calculate it from the circumference: a = c² / 4π. If you are interested in calculations of some fraction of a circle, check:

  3. www.omnicalculator.com › math › circumference-area-circleCircumference and Area of a Circle Calculator

    6 dni temu · Formula to calculate the circumference and area of a circle. These are the formulas to calculate the circumference and area of a circle: c = 2πr. A = πr² = πd²/4. where: c stands for circumference; r for radius; and. d for the diameter of the circle.

  4. www.khanacademy.org › cc-7th-area-circumference › aRadius, diameter, & circumference | Circles (article) | Khan...

    Once you have the radius you times the radius by 2 and times it by pie and then you get the circumference. Here are the two different formulas for finding the circumference: C = πd

  5. www.calculator.net › circle-calculatorCircle Calculator

    The radius, diameter, and circumference of a circle are all related through the mathematical constant π, or pi, which is the ratio of a circle's circumference to its diameter.

  6. goodcalculators.com › circle-calculatorCircle Calculator | Good Calculators

    Circle Calculator. With our Circle Calculator, you can determine the area, circumference, radius, and diameter of a circle by entering just one known value. The calculator will automatically calculate the other values. Formulas. This calculator uses the following formulas: Radius = Diameter / 2. Circumference of a circle = 2 × π × Radius.

  7. byjus.com › radius-formulaRadius Formula of a Circle Using Diameter, Area and Circumference...

    Solution: Given, Circumference of the circle = C = 22 cm. Let “r” be the radius of the circle.