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What is the measure of angle A in the triangle below?
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You can use any of the trig functions for this. Do you know sine or cosine or tangent?
yes
well pick your favorite one and set up the ration and do the division
err ratio, not ration
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check out the Kahn Academy trig videos... the first one is great and look at the unit circle while you are there best 7 minutes I have ever seen explaining trig functions
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