A Teacher-Made Slide Program
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The Past
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Anyone interested in the teaching of secondary school mathematics cannot but be impressed and overwhelmed by the vast number of texts and visual aids which have been produced within the past few years. It came, therefore, as a surprise to find, when looking for a filmstrip on the introduction of the trigonometric functions, that none was available. Visual aids on the subject of trigonometry seemed limited to numerical applications in the right triangle. Out of this fruitless search was born a challenging and satisfying project. If we could not purchase the filmstrip we wanted, we would produce our own.
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1970 ◽
Vol 70
(4)
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pp. 281-291
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Keyword(s):