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Calculate the Area of a 20ft Diameter Circle Easily

Learn how to swiftly calculate the area of a 20ft diameter circle using a simple formula.

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Video transcript

The area of a circle is found using the formula A = πr². For a 20ft diameter circle, the radius (r) is half the diameter: 20ft / 2 = 10ft. Plug this into the formula: A = π (10ft)² ≈ 3.14 100ft² = 314 square feet.

Questions and answers

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

    The area of a circle is calculated using the formula A = πr², where r is the radius.

  2. How do I find the radius of a circle given the diameter?

    To find the radius, divide the diameter by 2. For example, a 20ft diameter circle has a radius of 10ft.

  3. Why is π important in geometry?

    π (pi) is a constant used to calculate the circumference and area of circles, representing the ratio of the circumference to the diameter.

  4. Can I use this formula for circles of any size?

    Yes, the formula A = πr² applies to circles of any size, just use the appropriate radius.

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