The first six books of the elements of Euclid : with a commentary and geometrical exercises ; to which are annexed a treatise on solid geometry, and short essays on ancient geometrical analysis, and the theory of transversals (1861)
Lardner, Dionysius, 1793-1859 · London : Print. for Taylor and Walton · leaf 311
\ 3 7T … M S N BOOK THE FOURTH. 293 A B: BOr=CI : IK;or AB : MN = CI : IK. ABxIK = MNxCI. Hence the solid described by the isosceles triangle A B C is equaltofTrxMNxCP. Proposition XIV. (250) Let AB, BC, CD, be several sides of a regular polygon, O its centre, andO I the radius of the inscribed circle ;…
Geometry
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