The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 374
Through P draw any straight line to cut the circle in Q and R. At Q and R draw tangents and let them meet in T. [III. 17. Join OP and draw from T a perpendicular TL on OP or OP produced. Join OT and let it meet QR in N. Then OQT is a A having OQT a right z, and QN is perpendicular to the base OT ;…
Euclid's Elements · Geometry · Mathematics, Greek
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