To find the diameter, circumference, radius, and area of a circle, you'll need to know at least one measurement, typically either the radius or the diameter.
Here are the relevant formulas:
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Diameter (d): This is twice the radius. \[ d = 2 \times r \]
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Circumference (C): The circumference is calculated with the formula: \[ C = \pi \times d \] or \[ C = 2 \times \pi \times r \]
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Radius (r): This is half of the diameter. \[ r = \frac{d}{2} \]
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Area (A): The area is calculated with the formula: \[ A = \pi \times r^2 \]
If you provide a specific measurement (either the radius or diameter), I can help you calculate the rest.