Elements of geometry : containing books I to III (1886)
Smith, J. Hamblin · Toronto : W.J. Gage · leaf 52
es 2,::, 5, 8 Exterior Tlir angles marked 1 and 7 are called aitemah angles.The angles marked I ami 6 are also called alternate angle ,The pairs of angles l and •■. 2 and <i, l and \ :i ;iml Tancalled corresponding angles. from L 13 it is clear that the angles I, 1,0, Tareer i qnnl to foti Book… … Let the st. line EF, falling on the st. linos AB, CD, make the alternate l s AGU, GHD equal Then must AB be II to CD. For if not, AB and CD will meet, if produced, either towardsB, D, or towards A, C. Let them be produced and meet towards B, D in A.Then GHK is a a ; and .-. l AGH is greater than z…
Geometry
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