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Mathematics LibreTexts

6.3E: Points on Circles Using Sine and Cosine (Exercises)

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section 5.3 exercise

1. Find the quadrant in which the terminal point determined by t lies if

a. sin(t)<0 and cos(t)<0
b. sin(t)>0 and cos(t)<0

2. Find the quadrant in which the terminal point determined by t lies if

a. sin(t)<0 and cos(t)>0
b. sin(t)>0 and cos(t)>0

3. The point P is on the unit circle. If the y-coordinate of P is 35, and P is in quadrant II, find the x coordinate.

4. The point P is on the unit circle. If the x-coordinate of P is 15, and P is in quadrant IV, find the y coordinate.

5. If cos(θ)=17 and θ is in the 4th quadrant, find sin(θ).

6. If cos(θ)=29 and θ is in the 1st quadrant, find sin(θ).

7. If sin(θ)=38 and θ is in the 2nd quadrant, find cos(θ).

8. If sin(θ)=14 and θ is in the 3rd quadrant, find cos(θ).

9. For each of the following angles, find the reference angle and which quadrant the angle lies in. Then compute sine and cosine of the angle.

a. 225
b. 300
c. 135
d. 210

10. For each of the following angles, find the reference angle and which quadrant the angle lies in. Then compute sine and cosine of the angle.

a. 120
b. 315
c. 250
d. 150

11. For each of the following angles, find the reference angle and which quadrant the angle lies in. Then compute sine and cosine of the angle.

a. 5π4
b. 7π6
c. 5π3
d. 3π4

12. For each of the following angles, find the reference angle and which quadrant the angle lies in. Then compute sine and cosine of the angle.

a. 4π3
b. 2π3
c. 5π6
d. 7π4

13. Give exact values for sin(θ) and cos(θ) for each of these angles.

a. 3π4
b. 23π6
c. π2
d. 5π

14. Give exact values for sin(θ) and cos(θ) for each of these angles.

a. 2π3
b. 17π4
c. π6
d. 10π

15. Find an angle θ with 0<θ<360 or 0<θ<2π that has the same sine value as:

a. π3
b. 80
c. 140
d. 4π3
e. 305

16. Find an angle θ with 0<θ<360 or 0<θ<2π that has the same sine value as:

a. π4
b. 15
c. 160
d. 7π6
e. 340

17. Find an angle θ with 0<θ<360 or 0<θ<2π that has the same cosine value as:

a. π3
b. 80
c. 140
d. 4π3
e. 305

18. Find an angle θ with 0<θ<360 or 0<θ<2π that has the same cosine value as:

a. π4
b. 15
c. 160
d. 7π6
e. 340

19. Find the coordinates of the point on a circle with radius 15 corresponding to an angle of 220.

20. Find the coordinates of the point on a circle with radius 20 corresponding to an angle of 280.

21. Marla is running clockwise around a circular track. She runs at a constant speed of 3 meters per second. She takes 46 seconds to complete one lap of the track. From her starting point, it takes her 12 seconds to reach the northernmost point of the track. Impose a coordinate system with the center of the track at the origin, and the northernmost point on the positive y-axis. [UW]

a. Give Marla’s coordinates at her starting point.
b. Give Marla’s coordinates when she has been running for 10 seconds.
c. Give Marla’s coordinates when she has been running for 901.3 seconds.

Answer

1. a. III
b. II

3. 45

5. 437

7. 558

9. a. reference: 45. Quadrant III. sin(225) = 22. cos(225) = 22
b. reference: 60. Quadrant IV. sin(300) = 32. cos(300) = 12
c. reference: 45. Quadrant II. sin(135) = 22. cos(135) = 22
d. reference: 30. Quadrant III. sin(210) = 12. cos(210) = 32

11. a. reference: π4. Quadrant III. sin(5π4) = 22. cos(5π4) = 22
b. reference: π6. Quadrant III. sin(7π6) = 12. cos(7π6) = 32
c. reference: π3. Quadrant IV. sin(5π3) = 32. cos(5π3) = 12
d. reference: π4. Quadrant II. sin(\dfrac{3\pi}{4}\)) = 22. cos(3π4) = 22

13. a. sin(3π4) = 22 cos(3π4) = 22
b. sin(23π6) = 12 cos(23π6) = 32
c. sin(π2) = -1 cos(π2) = 0
d. sin(5π) = 0 cos(5π) = -1

15. a. 2π3
b. 100
c. 40
d. 5π3
e. 235

17. a. 5π3
b. 280
c. 220
d. 2π3
e. 55

19. (-11.491, -9.642)


This page titled 6.3E: Points on Circles Using Sine and Cosine (Exercises) is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by David Lippman & Melonie Rasmussen (The OpenTextBookStore) via source content that was edited to the style and standards of the LibreTexts platform.

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