The elements of Euclid : viz, the first six books, together with the eleventh and twelfth : the errors, by which Theon, or others, have long ago vitiated these books, are corrected, and some of Euclid's demonstrations are restored : also, The book of Euclid's data, in like manner corrected (1834)
Euclid, Euclid, Simson, Robert, 1687-1768 · Philadelphia : Desilver & Thomas · leaf 181
plane CAD to theplane CAE, and the angle GMN is the inclination of the planeFBG to the plane FBH, which planes have therefore the sameinclination (7. def. 11.) to one another: and in the same mannerit may be demonstrated, that the other planes in which the equalangles are, have the same inclination… … 1/8 THE ELEMENTS OF EUCLID. BOOK XI,* alike situated; these solid angles are equal to one an-other.^ Let there be two solid angles at A and B, of which the solidangle at A is contained by the three plane angles CAD; CAE,EAD; and that at B, by the three plane angles FBG, FBH, HBG5of which CAD is…
Mathematics, Greek · Geometry · Trigonometry
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