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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 › circumferenceCircumference Calculator

    2 dni temu · The formula for the circumference, if the circle's radius is given, is: 2 × radius × π; Or if the circle's diameter is given: Diameter × π; You can estimate π as 3.14.

  3. 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:

  4. calculator-online.net › volume-of-a-circle-calculatorVolume of a Circle Calculator

    Volume of a Circle Formula: If your goal comes up with the manual calculations of the volume of a circle, then you need to use the following circle volume formula: Volume of Circle = π * R2 R 2 * H. where; π = Constant value. R = Radius of the circle. H = Height of the circle.

  5. 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

  6. www.khanacademy.org › v › circles-radius-diameter-and-circumferenceRadius, diameter, circumference & π (video) | Khan Academy

    Learn how the number Pi allows us to relate the radius, diameter, and circumference of a circle. Created by Sal Khan.

  7. www.khanacademy.org › v › finding-radius-and-diameter-from-circumferenceRadius & diameter from circumference (video) | Khan Academy

    The circumference given the radius can be found using C = 2πr. C is the circumference. r is the radius. 4 comments. ( 18 votes) Upvote. Downvote. Flag. Show more... Gothic_Robot. 5 years ago. um i really need help with this i keep getting confused with circumference and radius. •. ( 19 votes) Upvote. Downvote.