Unit Circle (version B) - Examen
- 1. The magnitude of the radius of a unit circle is
A) r
B) √2/2
C) 1
D) √3/2
E) π
- 2. The sine of an angle is equal to
A) y
B) r
C) x
D) theta
E) 1
- 3. How many degrees in a unit circle?
A) 2π
B) 180
C) 360
D) 1
E) π
- 4. The cosine of an angle is equal to
A) 1
B) y
C) theta
D) r
E) x
- 5. The magnitudes of the maxima and minima of the unit circle's sine and cosine are the same.
A) true
B) Can't be determined
C) Neither
D) false
- 6. The range of a cosine curve from the unit circle
A) -infinity to +infinity
B) 0 to 2π
C) -1 to 1
D) 0 to 360
- 7. For the unit circle, the zero of the cosine function occurs at
A) 90 degrees
B) both 90 and 270 degrees
C) neither 90 nor 270 degrees
D) both 0 and 180 degrees
E) 270 degrees
- 8. The maximum value of the sine curve for the unit circle occurs at
A) 180 degrees
B) 270 degrees
C) 90 degrees
D) 0 degrees
- 9. For the unit circle, if I translate the sine curve XXX radians, it will be in the same position as the cosine curve.
A) -π/2
B) π/2
C) 2π
D) -π
E) π
- 10. The sine of 90 degrees equals
A) 1/2
B) -√2/2
C) 1
D) 0
E) √2/2
- 11. The cosine of 45 degrees equals
A) -√2/2
B) √3/2
C) 45
D) √2/2
E) 1/2
- 12. 390 degrees is co-terminal with
A) -30 degrees
B) 330 degrees
C) -390 degrees
D) -330 degrees
A) 0
B) √3/2
C) 1
D) -1
E) 1/2
- 14. π radians is co-terminal with
A) 2π radians
B) 3π radians
C) 3π/2 radians
D) 1/2 radians
E) -π radians
- 15. 3π/4 radians is the same as
A) 3π/2 radians
B) 45 degrees
C) 315 degrees
D) 225 degrees
E) 135 degrees
- 16. Sine and Cosine are both negative in quadrant
A) II
B) IV
C) I
D) III
E) never
- 17. How many radians in a unit circle?
A) 3π/2
B) 3π
C) 2π
D) π/2
E) π
- 18. One cycle of the sine and cosine curve from the unit circle have the same period.
A) True
B) False
C) Can't be determined
D) Neither
- 19. 270 degrees is equal to
A) 90 degrees
B) π/2 radians
C) 2π radians
D) 3π/2 radians
- 20. The cosine function is positive and the sine function is negative in quadrant
A) IV
B) III
C) III
D) I
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