Sark, Samuel M. [from old catalog] · Circleville, Ohio, The author · leaf 13
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… … Fig. 2. (m) In fig. 2, A D E and E D B are right angles. AD C is an acute angle. C D B is an obtuse angle. (n) A convex surface is one that bulges out in aspherical form, like the outside of an egg shell. (o) A concave surface curves in, like the inside of anegg shell- (p) A plane has length and…
Astronomy, Juvenile and popular
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