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Review Questions
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9.1 Basic Functions
 
9.2 Solving Right Triangles
 
9.3 Trigonometric Identities
 
9.4 Graphing Trigonometric Functions
 
9.5 The Unit Circle
 
 
9.6 Radians and Degrees
 
9.7 Graphing in the Entire Coordinate Plane
 
9.8 Key Formulas
 
9.9 Review Questions
 
9.10 Explanations
 
Review Questions
1. In the triangle below, what is the length of AC?
(A) 0.56
(B) 0.95
(C) 1.30
(D) 1.71
(D) 5.54
2. In the triangle below, what is the measure of ?
(A) 32.2º
(B) 40.2º
(C) 48.5º
(D) 49.7º
(D) 50.8º
3. A boy flies a kite 100 feet from the ground. If the angle of elevation of the kite string is 55º, how many feet long is the kite string?
(A) 70.0
(B) 98.5
(C) 122.1
(D) 155.0
(D) 174.3
4. If then x = ?
(A) 30º
(B) 45º
(C) 60º
(D) 75º
(D) 90º
5. If and sin and cos are greater than zero, which of the following values could not be ?
(A) 10º
(B) 65º
(C) 90º
(D) 110º
(D) 165º
6. The graph of y = 3 sin (bx) crosses the x-axis seven times in the interval What is the value of b?
(A) 2
(B) 7/3
(C) 3
(D) 4
(D) 7
7. What is the period and amplitude of the graph of the function y = 2 cos(4x + 2) – 7?
(A) period = π/2; amplitude = 2
(B) period = π; amplitude = 2
(C) period = 7π/2; amplitude = 4
(D) period = 2; amplitude = 2
(D) period = 4; amplitude = 2π
8. Find the area of triangle ABC pictured below:
(A) 10.44
(B) 12.30
(C) 14.14
(D) 15.69
(D) 27.47
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