Given Two Angles - Trignometry - Lecture Notes, Study notes of Trigonometry

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Advanced Algebra Section Trig2.1 LT: Use Law of Sines to find missing sides & angles (given 2 angles & a side) sind sinB _ sinc e Law of Sines: = = a b ¢ o These don’t need to be right triangles o ais the length of the side opposite angle A «Find the missing angle (all angles add to 180°) e Use proportions to find the missing sides e Can still use right triangle trig if an angle is 90° Examples Find the missing angle and sides. Round to 2 decimal places. 1) A=42°,B=65°,c=5 aoe C= (40-42-65 —_ Ven a \ ue 4 aye a, 6 én A _ S10 cS sie yg ae a «= Ga a Sin 8 nd Sn 6S Oo 50S = Fate EK on 1 (e = 3.50) us a0 2) B=53°,C=100°,b=9 & A= \4e-100 - 53 ab aw ar i ke cf e 3, So UY Sin 83 jess 5A SS a = a ain 5372 9 waa Sin lOO” =m sy pass | 8D 2 4 @e cS SP = TSONS = 2 A=5.\ Zn 3? $n SS f (c= L.10] ane s (v =4.04] = = ef — os ban I= S3in OS 1/2