Trigonometry

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Chadwickharrison
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Expressing in terms of ratios of acute angles
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davros
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(Original post by Chadwickharrison)
Expressing in terms of ratios of acute angles
I think you've missed out some information if you want help on a problem
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Chadwickharrison
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sin 205
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davros
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(Original post by Chadwickharrison)
sin 205
Are you familiar with the graph of y = sin x? Do you know some periodicity properties of the sine function or some formulae like sin(180 - x) = sin x?

Alternatively think about how the sine and cosine functions relate to the x and y coordinates of a point moving round the unit circle - where would you plot a point that has rotated through 205 degrees from the positive x-axis, and how could you construct a related similar triangle for a point in the 1st quadrant?
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