Elements of geometry, containing books I and II with exercises and notes (1882)
Smith, J. Hamblin (James Hamblin), 1829-1901 · Toronto : Gage · leaf 52
IFThe angles numbered 1, 4, 6, 7 are called Interior angles. 2, 3, 5, 8 Exterior The angles marked 1 and 7 are called alternate angles.The angles marked 4 and 6 are also called alternate angle?.The pairs of angles 1 and 5, 2 and G, 4 and 8, 3 and 7 arecalled corresponding angles. Note. From I. 13… … Proposition XXVil. Theorem. If a straight line, falling u]?on tivo other straight lines, makethe aUemate angles equal to one another; thes^, two straightli)ics must be parallel. =^IC Let the st. line EF, falling on the st. lines AB, CD, make the alternate z s AGH, GHD equal. Then must ABheWto CD.…
Geometry
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