Sark, Samuel M. [from old catalog] · Circleville, Ohio, The author · leaf 12
h, but no vol- ume. (c) A straight line is one that does not change its direc-tion throughout. (d) A curve line is one that changes its direction at everypoint. (e) Parallel lines are those, which, lying in the sameplane, would never meet ; no matter how far they be pro-duced. (£) An angle is the… … Fig.1. (i) The size of an angle depends entirely upon the dif-ference in direction of its sides and not at all upon thelength of those sides. (j) A right angle is one formed by a straight line meet- 8 ASTRONOMICAL GEOGRAPHY. ing another straight line making the adjacent angles equaLThe first line…
Astronomy, Juvenile and popular
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