# Express each ratio as a fraction and as a

8-4 Trigonometry Express each ratio as a fraction and as a decimal to the nearest hundredth.

1. sin A SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. So,

ANSWER:

ANSWER:

4. tan A SOLUTION: The tangent of an angle is defined as the ratio of the opposite side to the adjacent side. So,

ANSWER:

5. cos C SOLUTION: The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. So,

2. tan C SOLUTION: The tangent of an angle is defined as the ratio of the opposite side to the adjacent side. So,

ANSWER:

ANSWER:

6. sin C SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. So,

3. cos A SOLUTION: The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. So,

ANSWER:

4. tan A SOLUTION: The tangent of an angle is defined as the ratio of the opposite side to the adjacent side. So,

ANSWER:

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ANSWER:

7. Use a special right triangle to express sin as a fraction and as a decimal to the nearest hundredth.

SOLUTION:

Draw and label the side lengths of a 30?-60?-90? right triangle, with x as the length of the shorter leg.

Then the longer leg measures hypotenuse has a measure 2x.

and the

The side opposite the 60? angle has a measure of

and the hypotenuse is 2x units long.

Page 1

ANSWER: 8-4 Trigonometry

7. Use a special right triangle to express sin as a fraction and as a decimal to the nearest hundredth.

SOLUTION:

Draw and label the side lengths of a 30?-60?-90? right triangle, with x as the length of the shorter leg.

Then the longer leg measures hypotenuse has a measure 2x.

and the

ANSWER:

Find x. Round to the nearest hundredth.

8. SOLUTION: The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

The side opposite the 60? angle has a measure of and the hypotenuse is 2x units long.

Multiply both sides by 13.

Use a calculator to find the value of x. Make sure the mode of the calculator is in degrees.

ANSWER:

Find x. Round to the nearest hundredth.

8. SOLUTION: The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

Multiply both sides by 13.

Use a calculator to find the value of x. Make sure the mode of the calculator is in degrees.

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ANSWER: 16.64

9.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse.

Multiply both sides by x. Divide both sides by sin 61?.

Page 2

ANSWER: 8-4 T1r6i.g64onometry

ANSWER: 27.44

9. SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse.

Multiply both sides by x.

Divide both sides by sin 61?.

10. SOLUTION: The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse.

Multiply both sides by 19.

Use a calculator to find the value of x. Make sure the mode of the calculator is in degrees.

Use a calculator to find the value of x. Make sure the mode of the calculator is in degrees.

ANSWER: 27.44

ANSWER: 16.93

11. SPORTS David is building a bike ramp. He wants the angle that the ramp makes with the ground to be . If the board he wants to use for his ramp is

feet long, about how tall will the ramp need to be

at the highest point?

10. SOLUTION: The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse.

Multiply both sides by 19.

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SOLUTION: Let x be the height of the ramp. The length of the

ramp is

Multiply both sides by 42.

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8-4 TArNigSoWnoEmRe:try 16.93

11. SPORTS David is building a bike ramp. He wants the angle that the ramp makes with the ground to be . If the board he wants to use for his ramp is feet long, about how tall will the ramp need to be at the highest point?

SOLUTION: Let x be the height of the ramp. The length of the ramp is

ANSWER: about 1.2 ft CCSS TOOLS Use a calculator to find the measure of Z to the nearest tenth.

12. SOLUTION: The measures given are those of the leg opposite and the hypotenuse, so write an equation using the sine ratio.

Multiply both sides by 42.

Use a calculator to solve for the measure of angle Z. Make sure your calculator is in degree mode.

Use a calculator to find the value of x. Make sure your calculator is in degree mode.

ANSWER:

ANSWER: about 1.2 ft CCSS TOOLS Use a calculator to find the measure of Z to the nearest tenth.

12. SOLUTION:

eSolutTiohnse Mmaenausaul -rPesowgeirveednbyarCeogthneorsoe of the leg opposite and the hypotenuse, so write an equation using

the sine ratio.

13. SOLUTION: The measures given are those of the leg adjacent to and the hypotenuse, so write an equation using the cosine ratio.

Page 4

ANSWER: 8-4 Trigonometry

ANSWER:

13.

SOLUTION: The measures given are those of the leg adjacent to

and the hypotenuse, so write an equation using the cosine ratio.

14.

SOLUTION: The measures given are those of the leg opposite

and the hypotenuse, so write an equation using the sine ratio.

Use a calculator to solve for the measure of angle Z. Make sure your calculator is in degree mode.

Use a calculator to solve for the measure of angle Z. Make sure your calculator is in degree mode.

ANSWER:

14. SOLUTION: The measures given are those of the leg opposite and the hypotenuse, so write an equation using the sine ratio.

ANSWER:

15. Solve the right triangle. Round side measures to the nearest tenth and angle measures to the nearest degree.

SOLUTION: In a right triangle, the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse.

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Use a calculator to solve for the measure of angle Z. Make sure your calculator is in degree mode.

Page 5

SOLUTION:

In a right triangle, the sum of the squares of the 8-4 Tlerniggothnsoomf ethtreylegs is equal to the square of the length

of the hypotenuse.

ANSWER: RS 6.7; m R

;m T

Find sin J, cos J, tan J, sin L, cos L, and tan L. Express each ratio as a fraction and as a decimal to the nearest hundredth.

The measures given are those of the leg opposite and the hypotenuse, so write an equation using

the sine ratio.

Use a calculator to find the measure of angle R. Make sure your calculator is in degree mode.

16. SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse.

The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse.

The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

ANSWER:

The sum of the measures of the angles of a triangle is 180. Therefore,

ANSWER: RS 6.7; m R

;m T

Find sin J, cos J, tan J, sin L, cos L, and tan L. Express each ratio as a fraction and as a decimal to the nearest hundredth.

16.

SOLUTION: eSolutTiohnes Msianneuaol f- PaonwaenregdlebyisCodgenfeinroed as the ratio of the

opposite side to the hypotenuse.

17.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse.

The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse.

The tangent of an angle is defined as the ratio of the

opposite side to the adjacent side.

Page 6

8-4 Trigonometry

17. SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse.

The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse.

The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

18.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

ANSWER:

ANSWER:

18. SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

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19.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

ANSWER:

Page 7

8-4 Trigonometry

19.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

20.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

ANSWER:

ANSWER:

20.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

21.

SOLUTION: The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. The cosine of an angle is defined as the ratio of the adjacent side to the hypotenuse. The tangent of an angle is defined as the ratio of the opposite side to the adjacent side.

ANSWER:

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ANSWER:

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