It looks like you are presenting definitions related to a circle. Here are the terms and their correct definitions:
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Radius: The distance from the center of the circle to any point on the outer edge of the circle.
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Diameter: The distance all the way across the circle, passing through the center. It is twice the length of the radius.
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Circumference: The distance around the circle. It can be calculated using the formula \( C = 2\pi r \) or \( C = \pi d \), where \( r \) is the radius and \( d \) is the diameter.
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Area: The amount of space inside the circle. It can be calculated using the formula \( A = \pi r^2 \), where \( r \) is the radius.
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