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A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.

A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and ... - Page iii
by Daniel Cresswell - 1816 - 294 pages
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Practical Essays on Mill Work and Other Machinery: With Notes and Additional ...

Thomas Tredgold, Robertson Buchanan - 1999 - 571 pages

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The Elements of Geometry: Or, The First Six Books, with the Eleventh and ...

Euclid - Euclid's Elements - 1859 - 254 pages

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Arithmetic for Competitive Examinations

N.M. Kapoor - 2006 - 886 pages

...area = n (R2 + r2 + R/ + rl) Slant height (/) = V/.2 + (Rr)2 8. Sphere : A sphere is a solid bounded by one surface and is such that all straight lines drawn from a certain point within the solid to the bounding surface are equal. This certain point is called the centre of the sphere. A line...

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