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 312
ing the feetof the perpendiculars is perpendicular to the former straight line. 7. If 0 is the centre of the circumcircle of a triangle ABC and OPbe drawn perpendicular to the plane of the triangle, prove that anypoint in OP is equidistant from the vertices A, B, C. ##8. Show how to construct the… … Let AB and CD be the two given straight lines; through AB drawthe plane AEB, which contains AB and a straight line AE parallel toCD ; this plane is therefore parallel to CD. Draw DF perp^ to thisplane and let the plane CDF cut the plane AEB in the straight lineFG. Let FG meet AB in G and draw GH…
Euclid's Elements · Geometry · Mathematics, Greek
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