Manning, Henry Parker, 1859- · Boston, U.S.A., Ginn & Company · leaf 49
we please (see p. 27). In figure on page 38, let A C be perpendicular to AB, D beingany point on A C and DE parallel to AB. Draw DK beyond DE,making with DE an angle, EDK = II (p), and make DK = p.TF, perpendicular to DK at K, will be parallel to DE and AB. 38 NON-EUCLIDEAN GEOMETRY By placing PMN… … Starting from the point G, we can repeat this construction,and each time we subtract from the angle of parallelism anamount greater than a. We can continue this process untilthe angle of parallelism becomes equal to or less than 2 a. If the point D move along AC, DE remaining constantlyparallel to…
Geometry, Non-Euclidean
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