How to Calculate the Area of a Circle with a Diameter of 20 cm

Learn how to calculate the area of a circle with a diameter of 20 cm using the radius and the area formula.

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The area of a circle with a diameter of 20 cm is calculated using the formula: Area = π * (radius)^2. The radius is half of the diameter, so it is 10 cm. Therefore, the area is π * 10^2, which is approximately 314.16 square centimeters.

FAQs & Answers

  1. What is the formula for calculating the area of a circle? The formula for calculating the area of a circle is Area = π * (radius)^2.
  2. How do you find the radius of a circle if you know the diameter? To find the radius of a circle, divide the diameter by 2. For example, if the diameter is 20 cm, the radius is 10 cm.
  3. What is the area of a circle with a diameter of 30 cm? To find the area, first calculate the radius (30 cm / 2 = 15 cm) and then use the formula: Area = π * (15)^2, which is approximately 706.86 square centimeters.
  4. Why is the area of a circle important? The area of a circle is important in various fields such as geometry, engineering, and physics, as it helps in calculations related to circular shapes and designs.

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