A Trigonometric Path into the Land of Regular Pentagons - National ...

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Worksheet #2 – Extra Practice ANSWER KEY Use the right triangle to answer the following questions. E a b D c F 1. Sin D = b/a 2. Cos E = b/a 3. Tan D = b/c 4. Tan E = c/b 5. Sin E = c/a 6. Cos D = c/a Use the right triangle to write the ratio and the decimal approximation. E 13 5 D 12 F 1. Sin D = 5/13 ≈ .3864 2. Cos E = 5/13 ≈ .3864 3. Tan D = 5/12 ≈ .4167 4. Tan E = 12/5 ≈ 2.4 5. Sin E = 12/13 ≈ .9231 6. Cos D = 12/13 ≈ .9231
Use your calculator to find the values for each problem. Reminder: If using a graphing calculator, the mode should be degree. 7. Sin 33º ≈ .5446 8. Cos 85º ≈ .0872 9. Tan 2º ≈ .0349 10. Tan 66º ≈ 2.2460 11. Cos 45º ≈ .7071 12. Sin 74º ≈ .9613 Use the right triangle to find each of the following. T 1 5 S 2 R 13. Sin R = 1 14. Cos R = 2 5 5 15. Tan T = 2 16. Tan R = 1 2 17. Cos T = 1 18. Sin T = 2 5 5
Page 1 and 2: A Trigonometric Path into the Land
Page 3 and 4: Embedded Assessment • The teacher
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Page 18 and 19: Extension Worksheet: Finding the Mi
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Page 22 and 23: Example 2: Find x 16 x 81 ◦ Steps
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Page 26 and 27: Example 2: Find x 16 x 81 ◦ Steps
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Page 30 and 31: Worksheet #4: Practice Finding Miss
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Page 34 and 35: Worksheet #5: Trig Word Problems AN
Page 36 and 37: Worksheet #6 - Finding the Area of
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Page 40 and 41: Worksheet #7 - Pentagon Practice Us
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Page 44 and 45: Find the missing lengths. 9. 10. x
Page 46 and 47: Quiz - Trig Functions and Area of R
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