Chapter 12 Trigonometry Triangle

80 and b 385 3 solve given c 90 0 b 480 and a

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Unformatted text preview: the reference angle in the fourth quadrant. Remember … •  The reference angle is measured from the terminal side of the original angle "to" the x- axis (not the y- axis). •  Also, it is always the acute angle that is formed from the terminal side of an angle 1st quadrant α = angle 2 nd quadrant 1800 − α rd 0 3 quadrant α − 180 4th quadrant 3600 − α 0 0 a)130 b) − 230 1) Find the reference angle for the given angles 0 2) Write cos 300 as a fn of an acute angle 0 3)Write sin 160 as a fn of an acute angle 0 4) Write cos (- 300 ) as a fn of an acute angle α 3 sinhe = other trig fns <fα < 2700 α 5 − and 1800 o if 5) Write t 4 Day 1: CW: p565 Oral #1- 5,7,9,11,14,16,18 HW: p566 Wricen #2,4,5- 8,10- 24 even Day 2: P566 #25- 51 odd 12.4 Values of Trig Fns Find each value to 4 significant digits: Page 571 oral #1- 24 CW/HW: p572 #1- 41 odd Day 2: Q + A on 12.1- 12.4 P573 Self Test 1 #1- 8 HW: Study Day 3: 12.5 Solving Right Triangles Solving a right triangles means to find all 3 angle measures and all 3 side measures. Always sketch the triangle and insert the given 0 informa5on 1) Given right ΔABC , where < A = 34.6 and a = 120 1) Given right ΔABC , where < A = 34.60 and a = 1...
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