"radii" meaning in English

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          "ref": "1767, Richard Helsham, Bryan Robinson, A Course of Lectures in Natural Philosophy, page 31:",
          "text": "Now the centrifugal forces of bodies revolving in the ſame time in different circles being to one another as the radii of the circles (as ſhall be ſhewn when I come to treat of thoſe forces) it follows that the centrifugal force muſt be greateſt at the æquator, and thence be continually diminished towards the poles.",
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