Trigonometry LESSON ONE  Degrees and Radians Lesson Notes


 Clyde Flynn
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1 = 7 6 Trigonometry Example 1 Define each term or phrase and draw a sample angle. Angle Definitions a) angle in standard position: Draw a standard position angle,. b) positive and negative angles: Draw = 120 Draw = 120 c) reference angle: Find the reference angle of = 10.
2 Trigonometry = 7 6 d) coterminal angles: Draw the first positive coterminal angle of 60. e) principal angle: Find the principal angle of = 20. f) general form of coterminal angles: Find the first four positive coterminal angles of =. Find the first four negative coterminal angles of =.
3 = 7 6 Trigonometry Example 2 Three Angle Types: Degrees, Radians, and Revolutions. a) Define degrees, radians, and revolutions. Angle Types and Conversion Multipliers i) Degrees: Draw = 1 ii) Radians: Draw = 1 rad iii) Revolutions: Draw = 1 rev
4 Trigonometry = 7 6 b) Use conversion multipliers to answer the questions and fill in the reference chart. Round all decimals to the nearest hundredth. Conversion Multiplier Reference Chart i) 2 = rad degree radian revolution degree ii) 2 = rev radian iii) 2.6 = revolution iv) 2.6 = rev v) 0.7 rev = vi) 0.7 rev = rad c) Contrast the decimal approximation of a radian with the exact value of a radian. i) Decimal Approximation: = rad ii) Exact Value: = rad
5 = 7 6 Trigonometry Example Convert each angle to the requested form. Round all decimals to the nearest hundredth. a) convert 17 to an approximate radian decimal. Angle Conversion Practice b) convert 210 to an exactvalue radian. c) convert 120 to an exactvalue revolution. d) convert 2. to degrees. e) convert to degrees. 2 f) write as an approximate radian decimal. 2 g) convert to an exactvalue revolution. 2 h) convert 0. rev to degrees. i) convert rev to radians.
6 Trigonometry = 7 6 Example The diagram shows commonly used degrees. Find exactvalue radians that correspond to each degree. When complete, memorize the diagram. Commonly Used Degrees and Radians a) Method One: Find all exactvalue radians using a conversion multiplier. b) Method Two: Use a shortcut. (Counting Radians) 90 = = 10 = 1 = = = 0 = 0 = = = = 210 = 22 = 20 0 = 1 = 00 = = 270
7 = 7 6 Trigonometry Example a) 210 Draw each of the following angles in standard position. State the reference angle. Reference Angles b) 260 c). d)  e) 12 7
8 Trigonometry = 7 6 Example 6 a) 90 Draw each of the following angles in standard position. State the principal and reference angles. Principal and Reference Angles b) 8 c) 9 d)  10
9 = 7 6 Trigonometry For each angle, find all coterminal Example 7 Coterminal Angles angles within the stated domain. a) 60, Domain: 60 < 1080 b) 9, Domain: < 720 c) 11.78, Domain: 2 < d) 8, Domain: 1 2 < 7
10 Trigonometry = 7 6 Example 8 For each angle, use estimation to find the principal angle. a) 189 b) 7.2 Principal Angle of a Large Angle 912 c) d) 1 9 6
11 = 7 6 Trigonometry Example 9 a) principal angle = 00 (find coterminal angle rotations counterclockwise) Use the general form of coterminal angles to find the specified angle. General Form of Coterminal Angles 2 b) principal angle = (find coterminal angle 1 rotations clockwise) c) How many rotations are required to find the principal angle of 00? State the principal angle. d) How many rotations are required to find 2 the principal angle of? State the principal angle.
12 Trigonometry = 7 6 Example 10 Six Trigonometric Ratios In addition to the three primary trigonometric ratios (sin, cos, and tan), there are three reciprocal ratios (csc, sec, and cot). Given a triangle with side lengths of x and y, and a hypotenuse of length r, the six trigonometric ratios are as follows: sin = y r csc = 1 sin = r y r y cos = x r sec = 1 cos = r x x tan = y x cot = 1 tan = x y a) If the point P(, 12) exists on the terminal arm of an angle in standard position, determine the exact values of all six trigonometric ratios. State the reference angle and the standard position angle. b) If the point P(2, ) exists on the terminal arm of an angle in standard position, determine the exact values of all six trigonometric ratios. State the reference angle and the standard position angle.
13 = 7 6 Trigonometry Example 11 Determine the sign of each trigonometric ratio in each quadrant. Signs of Trigonometric Ratios a) sin b) cos c) tan d) csc e) sec f) cot g) How do the quadrant signs of the reciprocal trigonometric ratios (csc, sec, and cot) compare to the quadrant signs of the primary trigonometric ratios (sin, cos, and tan)?
14 Trigonometry = 7 6 Example 12 Given the following conditions, find the quadrant(s) where the angle could potentially exist. What Quadrant(s) is the Angle in? a) i) sin < 0 ii) cos > 0 iii) tan > 0 b) i) sin > 0 and cos > 0 ii) sec > 0 and tan < 0 iii) csc < 0 and cot > 0 c) i) sin < 0 and csc = 1 ii) and csc < 0 iii) sec > 0 and tan = 1 2
15 = 7 6 Trigonometry Example 1 Given one trigonometric ratio, find the exact values of the other five trigonometric ratios. State the reference angle and the standard position angle, to the nearest hundredth of a radian. Exact Values of Trigonometric Ratios a) b)
16 Trigonometry = 7 6 Example 1 Given one trigonometric ratio, find the exact Exact Values of values of the other five trigonometric ratios. Trigonometric Ratios State the reference angle and the standard position angle, to the nearest hundredth of a degree. a) b)
17 = 7 6 Trigonometry Example 1 Calculating with a calculator. Calculator Concerns a) When you solve a trigonometric equation in your calculator, the answer you get for can seem unexpected. Complete the following chart to learn how the calculator processes your attempt to solve for. If the angle could exist in either quadrant or... The calculator always picks quadrant I or II I or III I or IV II or III II or IV III or IV b) Given the point P(, ), Mark tries to find the reference angle using a sine ratio, Jordan tries to find it using a cosine ratio, and Dylan tries to find it using a tangent ratio. Why does each person get a different result from their calculator? P(, ) Mark s Calculation of (using sine) sin = Jordan s Calculation of (using cosine) cos = Dylan s Calculation of (using tan) tan = = 6.87 = 1.1 = 6.87
18 Trigonometry = 7 6 Example 16 Arc Length The formula for arc length is a = r, where a is the arc length, is the central angle in radians, and r is the radius of the circle. The radius and arc length must have the same units. r a) Derive the formula for arc length, a = r. a b) Solve for a, to the nearest hundredth. c) Solve for. (express your answer as a degree, to the nearest hundredth.) 6 cm cm 1 cm a d) Solve for r, to the nearest hundredth. e) Solve for n. (express your answer as an exactvalue radian.) 1.2 cm cm r 2 6 cm n
19 = 7 6 Trigonometry Example 17 Area of a circle sector. r 2 a) Derive the formula for the area of a circle sector, A =. 2 Sector Area r In parts (b  e), find the area of each shaded region. b) c) cm 7 6 cm 20 d) e) 9 cm cm cm
20 Trigonometry = 7 6 Example 18 The formula for angular speed is, where ω (Greek: Omega) is the angular speed, is the change in angle, and T is the change in time. Calculate the requested quantity in each scenario. Round all decimals to the nearest hundredth. a) A bicycle wheel makes 100 complete revolutions in 1 minute. Calculate the angular speed in degrees per second. b) A Ferris wheel rotates 1020 in. minutes. Calculate the angular speed in radians per second.
21 = 7 6 Trigonometry c) The moon orbits Earth once every 27 days. Calculate the angular speed in revolutions per second. If the average distance from the Earth to the moon is 8 00 km, how far does the moon travel in one second? d) A cooling fan rotates with an angular speed of 200 rpm. What is the speed in rps? e) A bike is ridden at a speed of 20 km/h, and each wheel has a diameter of 68 cm. Calculate the angular speed of one of the bicycle wheels and express the answer using revolutions per second.
22 Trigonometry = 7 6 Example 19 A satellite orbiting Earth 0 km above the surface makes one complete revolution every 90 minutes. The radius of Earth is approximately 670 km. a) Calculate the angular speed of the satellite. Express your answer as an exact value, in radians/second. 0 km 670 km b) How many kilometres does the satellite travel in one minute? Round your answer to the nearest hundredth of a kilometre.
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