Elements of geometry : containing books I to VI and portions of books XI and XII of Euclid, with exercises and notes (1881)
Smith, J. Hamblin (James Hamblin), 1829-1901, Kirkland, Thomas, 1835-1898 · Toronto : W.J. Gage · leaf 334
s a rt. z .BA and GH are both H to ED,BA is i I to GH, I s GBA, BGH together = two rt. i s.But I BGH is a rt. z ..-. z GBA is a rt. z .Hence GB is ± to BA ; and GB is jl to BC, for the same reason ; .-. GB is ± to the plane AC. XL 4. Also, GB is ± to the plane DF; Constr. /. the plane ^C is II to… … Let the parallel planes AB, CD be cut by the plane EFHG, Then must EFhe\\ to GH. If they be not II, let them meet in K.Then •.• EF is in the plane AB, .. X is a point in the plane AB. XI. Def. 1. So also, X is a point in the plane CD. XI. Def. 1. .. the planes AB, CD meet, if produced.But they do…
Geometry · Geometry, Plane
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