Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 32
orems, corollaries,and problems. BOOK I 21 81. The necessity for proof. Some theorems seem evidentby merely looking at the figure, and the student will doubtlessthink a proof unnecessary. The eye, however, cannot alwaysdetect error, and reasoning enables us to be sure of our conclu-sions. The… … Ex. 44. In the figures below, are the lines everywhere the same dis-tance apart ? Verify your answer by using a ruler or a slip of paper.
Geometry, Plane · Geometry, Solid
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