Special Triangles Watch

Silverwing Sketcher
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#1
Report Thread starter 9 years ago
#1
I have the following question:

Using the special triangles, write down the value of sin255

I know the equilateral special triangle and the isosceles right-angled triangle, but those only works for calculating the values of sinx, cosx or tanx when x = 30, 60 or 45 degrees.

I'm a bit confused on how to approach this question; help would be kindly appreciated. Thanks.
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rupertj
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#2
Report 9 years ago
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Think about the period of sin. What does sin255 also equal in terms of sin?
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Silverwing Sketcher
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Report Thread starter 9 years ago
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just worked it out! thanks for your hint
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rnd
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(Original post by Silverwing Sketcher)
just worked it out! thanks for your hint
Even though you've solved it, here's a thought. I bet the question asked for sin(225) rather than sin(255).
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