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Trigonometry

Expressing in terms of ratios of acute angles
Reply 1
Avatar for davros
davros
16
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 :smile:
sin 205
Reply 3
Avatar for davros
davros
16
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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