Determine angle A in the range 180º < A < 360º. Round your answer to one decimal place. secA=-1.3171?
How is the answer 220.6 derived?
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How is the answer 220.6 derived?
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On a calculator, do inverse cosine (1 / 1.3171) because sec = 1 / cos so cos = 1 sec
It says 40.6024....
Then convert that to quadrant 3 as asked by adding 180º. (in quadrant 4, 270-360, sec and cos would have been positive.)