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How to Calculate the Area of a Circle: Example with a 20-Diameter Circle

Learn how to find the area of a circle with a 20 diameter using the formula for area calculation.

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Video transcript

The area of a circle with a 20 diameter can be calculated using the formula Area = π(r²). With a radius of 10 (half of the diameter), the area is π * 10², which equals approximately 314.16 square units.

Questions and answers

  1. What is the formula for the area of a circle?

    The formula for the area of a circle is Area = π(r²), where r is the radius.

  2. How do you convert diameter to radius?

    To convert diameter to radius, divide the diameter by 2.

  3. What does π (Pi) equal?

    π (Pi) is approximately equal to 3.14 and is the ratio of the circumference of a circle to its diameter.

  4. Can I calculate area with only the diameter?

    Yes, you can use the diameter to find the radius and then use the area formula.

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Continue exploring

For further understanding of geometry, check out our videos on circle properties and area calculations of different shapes.