How to Calculate the Area of a Circle with an 18 cm Diameter

Discover the step-by-step method to find the area of an 18 cm diameter circle using the formula A = πr².

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To find the area of a circle with an 18 cm diameter, use the formula A = πr^2. First, find the radius by dividing the diameter by 2, giving 9 cm. Then calculate the area: A = π × (9 cm)^2 ≈ 254.47 cm².

FAQs & Answers

  1. What is the formula for the area of a circle? The formula for the area of a circle is A = πr², where r is the radius.
  2. How do you find the radius of a circle from its diameter? To find the radius, divide the diameter by 2.
  3. What is the area of a circle with a radius of 10 cm? The area would be approximately 314.16 cm², calculated using A = π(10 cm)².
  4. Can you calculate the area of circles quickly? Yes, by memorizing the formula A = πr², you can quickly calculate areas of circles once you know the radius.

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For more math tutorials on geometry or to enhance your understanding of circle properties, check out our other videos on circle equations and area calculations.

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