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Trigonometry: opp sin A = hyp adj cos A = hyp opp tan A = adj Example 1 • Given c = 9 • A = 40 degrees; • Find side b. Answer: • Identify the given with your triangle. Given A = 40 Hyp = 9 • Identify what you have to find. • Adj ? • Which trig ratio would we set up? Answer part 2 : • Trig ratio • Cos A = adj • hyp • Cos 40 = b 9 b = 9*cos 40 b = 9(0.7660) b = 6.89 Example 2: • Given a = 5 • b= 4 • Find angle A Answer to #2 Adj 4 Opp 5 5 tan x = 4 1 5 tan = 51.34 4 A= 51.34 For a right triangle, True Or False: 1. 2. 3. 4. Sin (x) = cos (90 – x) Cos (x) = sin (90 – x) Tan (x) = tan (90 – x) Tan(x) = sin (x) cos (x) Work for today: • Investigate exact values and angles in standard position. • Complete p. 74 #1 to 4, • p. 75 to 76 # 6 to 16; • pass in one copy per group, of what you finish; everyone must complete as what you don’t finish in class is homework!!! • Problem solving is due Wed, June 8; •