Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 18
surface on which it was placed. A sheet offine plate glass more nearly approaches the ideal. 33. Questions. Test the surface of the blackboard with a ruler tosee whether it is a plane. How many times must you apply the ruler ?Can you think of a surface such thatthe ruler would fit in some… … Fig. 6. 34. Def. A plane surface (or plane) is a surface of unlimited extent such that whatever two ^ of its points are taken, a straight line joining tliem will lie wholly in the surface. 35. Def. A curved surface is a surface no portion of whichis plane. 36. Def. A plane figure is a geometric…
Geometry, Plane · Geometry, Solid
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