Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 194
one lineparallel to another. For example, suppose two boys are laying out a tennis courtand they wish to run a line through P parallel to AB. Take a60-foot tape and swing it around P until the other end rests onAB, as at M. Put a stake at 0, 30 feet ^ —% from Pand M. Thentake any convenientpoint N… … 184 THE TEACHING OF GEOMETRY Theorem. If two parallel lines are cut by a transversal,the exterior-interior angles are equal. This is also a part of Euclid I, 29. It is usually fol-lowed by several corollaries, covering the minor and ob-vious cases omitted by the older writers. While it wouldbe…
Geometry
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