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How to Calculate the Area of a Circle with a 5 cm Radius

Learn how to calculate the area of a circle with a 5 cm radius using the formula A = πr².

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Video transcript

What is the area of a 5 cm circle? The area of a circle is calculated using the formula A = πr². For a circle with a radius of 5 cm, the area is approximately 78.5 square centimeters. This can be derived by squaring the radius (5 cm) and multiplying by π (≈ 3.14).

Questions and answers

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

    The formula is A = πr², where A is the area and r is the radius.

  2. How do you find the radius if you know the area?

    You can find the radius by rearranging the formula: r = √(A/π).

  3. What does π represent in mathematics?

    π (pi) is a constant approximately equal to 3.14 that represents the ratio of a circle's circumference to its diameter.

  4. Can the area of a circle be negative?

    No, area is always a positive value as it represents the space within the shape.

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For more insights on geometry and mathematics, check out our tutorials on calculating volumes and areas of various shapes.