**1. Steps to Use the Tool:**

**Enter Radius or Diameter**: Input either the radius or the diameter of the circle. You can leave one of them blank.**Click Calculate**: Hit the “Calculate” button to compute the circumference and area of the circle.**View Result**: The calculated circumference and area will be displayed below the button.

**2. Information about the Tool:**

**Purpose**: The Circle Calculator computes the circumference and area of a circle based on the provided radius or diameter.**Functionality**: If only one value (radius or diameter) is provided, it calculates the missing value using the formula for the circle’s circumference or area.**Input Requirements**: Requires a valid positive numerical value for either the radius or diameter. Both fields can’t be left blank.**Output**: Provides the calculated circumference and area of the circle.

**3. Benefits of Using this Tool:**

**Flexibility**: Allows calculation based on either the radius or diameter, providing convenience.**Efficiency**: Quickly computes the circumference and area of a circle without manual calculations.**Accuracy**: Ensures accurate results based on the provided input value.**Conciseness**: Presents the calculated values in a clear and concise format.

**4. FAQ (Frequently Asked Questions):**

**Q: Can I input negative values for radius or diameter?**- A: No, the tool requires a valid positive numerical value for either the radius or diameter.

**Q: What happens if I leave both radius and diameter blank?**- A: The tool will prompt you to enter a valid positive value for either the radius or diameter.

**Q: How are the circumference and area calculated?**- A: The circumference is calculated using the formula 2𝜋𝑟, and the area is calculated using the formula
*πr*^{2}, where*r*is the radius of the circle.

- A: The circumference is calculated using the formula 2𝜋𝑟, and the area is calculated using the formula

This tool is useful for anyone needing to quickly calculate the circumference and area of a circle, such as students, teachers, and professionals working with geometric shapes.

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