If you draw a line from one side of a circle to the other, and that line hits the center, and goes all the way across, it is the diameter. half of that line going from the center
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Atomic radius is the distance from the atomic nucleus to the outermost
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The corners of a typical rectangular kitchen sink are quartercircles. The larger the radius of the circle, the more "round" the corner appears. When the corner is a 90
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radius of curvature: the radius of the circle of curvature
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