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Pearson Algebra 1 Common Core, 2011
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Pearson Algebra 1 Common Core, 2011 View details
6. Trigonometric Ratios
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Exercise 19 Page 649

Use a calculator and remember to choose degrees mode.

0.0872

Practice makes perfect
We can use a calculator to evaluate a trigonometric ratio using the COS button. Be sure to always check that your calculator is in the correct mode. In this case, we need degrees.
Now we can round the result to the nearest ten-thousandth.
cos 85^(∘)=0.08715574...
RoundSigDig

Round to 4 significant digit(s)

cos 85^(∘)≈ 0.0872
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arrow_right Lesson Check p.649
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arrow_right Practice and Problem-Solving Exercises p.649-651
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Practice and Problem-Solving Exercises 17 (Page 649)
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Practice and Problem-Solving Exercises 20 (Page 649)
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Practice and Problem-Solving Exercises 47 (Page 651)
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