Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 19
e linesof which are straight lines. Ex. 7. How can a plane move in space so that its path will not bea solid ? Ex. 8. Can a curved surface move in space so that its path will notbe a solid ? If so, how ? 8 PLANE GEOMETRY ANGLES 38. Def. An angle is the figure formed by two straightlines which… … Fig. 7. three letters may be used, one on each side and one at thevertex, the last being read between the other two; thus in Fig. 7,angle 1 may be read angle ABC, and angle 2, angle CBD, Anangle is often designated also by the single letter at its vertex,when no other angle has the same vertex, as…
Geometry, Plane · Geometry, Solid
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