Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 107
T-square, triangle, and protractor may be used, althoughthese latter instruments are not necessary. We should 96 THE TEACHING- OF GEOMETRY constantly remember that there is a danger in the slav-ish use of instruments and of such helps as squared paper. Just as Euclid rode roughshod over the growing… … The pupil who cannot see the equality of vertical anglesintuitively better than by the use of the protractor isabnormal. Nevertheless it is the pupils interest thatis at stake, together with his ability to use the instru-ments of daily life. If, therefore, he can readily be 1 Carson, loc. cit., p.…
Geometry
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