Download 9.6 Practice A

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9.6
Practice A
In Exercises 1–3, determine which of the two acute angles has the given
trigonometric ratio.
1. The sine of the angle is 8 .
17
2. The cosine of the angle is 15 .
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3. The tangent of the angle is 15 .
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In Exercises 4–6, let ∠ B be an acute angle. Use a calculator to approximate the
measure of ∠ B to the nearest tenth of a degree.
4. sin B = 0.64
5. cos B = 0.12
6. tan B = 2.18
In Exercises 7–9, solve the right triangle (Find all the missing sides and all the angles).
Round decimal answers to the nearest tenth.
7.
8.
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9.
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10. Use the diagram to find the distance across the suspension bridge. Round your
answer to the nearest foot.
11.Use the diagram to find the acute angle formed by
Washington Boulevard and Willow Way. Round
your answer to the nearest tenth.
9.6
Practice B
In Exercises 6–8, solve the right triangle. Round decimal answers to the nearest tenth.
6.
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7.
8.
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317
9.6 Practice A
1. R 2. R 3. Q
4. 39.8° 5. 83.1° 6. 65.4°
7. m P = 53°,QR Η17.6,PR Η13.2
8. m D Η 42.7°,DF Η 20.6,m E Η 47.3°
9. m A = 39°, BC Η11.3, AB Η18.0
10. 499 ft 11. 27.4°
9.6 Practice B
1. W 2. X 3. 24.2°
4. 87.1° 5. 79.1°
6. m T = 66°,ST Η 36.1,RT Η14.7
7. m E Η 41.4°,EF = 9,m D Η 48.6°
8. m P Η17.7°,PQ Η 21.9,m R Η 72.3°
9. a. about 1039 ft
b. about 1648 ft
c. about 609 ft
10. a. about 0.1 mi
b. about 0.8 mi
c. about 7.1°
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All rights reserved.