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How to Calculate the Diameter of a Circle from its Radius

Learn how to find the diameter of a circle when the radius is known. Simple and quick calculation explained.

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Video transcript

The diameter of a circle is simply twice the radius. Given a radius of 4 cm, the diameter would be 8 cm (4 cm * 2 = 8 cm). This relationship holds true for any circle, making it a quick and easy calculation.

Questions and answers

  1. What is the formula to calculate a circle's diameter?

    The formula to calculate the diameter of a circle is D = 2 * r, where D is the diameter and r is the radius.

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

    To find the radius from the diameter, divide the diameter by 2. The formula is r = D / 2.

  3. Why is it important to know the diameter of a circle?

    Knowing the diameter is crucial for calculating the area and circumference of a circle, which are important in various fields of study.

  4. Can you calculate the diameter of any circle?

    Yes, the formula for calculating diameter applies to all circles, regardless of size.

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