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 295
ined by two straight lines drawn from any the samepoint of their common section at right angles to it, one in oneplane, and the other in the other plane. 7. Two planes are said to have the same or a like inclinationto one another which two other planes have, when the saidangles of inclination are… … 9. A solid angle is that which is made by more than twoplane angles, which are not in thesame plane, meeting at one point. A solid angle contained by threeplane angles is called a trihedralangle; one contained by more thanthree plane angles is called a poly-hedral angle. a 10. The angle made by two…
Euclid's Elements · Geometry · Mathematics, Greek
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
