Elements of geometry : containing books I to III (1886)
Smith, J. Hamblin · Toronto : W.J. Gage · leaf 51
have detached the Propositions, in which Euclid treatsof Parallel Lines, from those which precede and follow them inthe First Book, in order that the student may have a dearernotion of the difficulties attending this division of the subject,and nf the way in which Euclid proposes to meet them. We… … ivThe angles numbered 1,4,6,7 are called Interior angles 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…
Geometry
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