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Published in:
1981 | OriginalPaper | Chapter
Trigonometry
Authors : Owen Perry, B.SC., Joyce Perry, B.SC.
Published in: Mathematics I
Publisher: Palgrave Macmillan UK
Included in: Professional Book Archive
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In chapter 11 angles were described in terms of degrees and in chapter 12 circular measure was introduced. There is a third method which describes an acute angle by the ratios of the sides of a right-angled triangle containing the angle. They are the trigonometrical ratios and at first we shall consider only three of them, the sine the cosine and the tangent of an angle.