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RF2_12D_Practice score: 0/3 0/2 answered The Law of Cosines . Question 2 " Previously, we saw that one way of writing the law of cosines is Determine all three angles of the follow en side lengths. Round your cal 1 6 2ab cos C. answers to one decimal place. Notice that the law of cosines involves three sides and one angle. sides of a triangle Part A: a - 17 cm. 6 - 11 cm. and c - 22 cm. the largest angle of the triangle. shown in the triangle. Find B - Solution : In the diagram. AB - 4. BC - 3. AD - 6, and the two marked angles are right angles. Part B: a- 34 ft. 6 - 11 ft, and c - 20) neles as shown in the diagram below other two Using the formula . =a7 4 87 - zab cos C. * 82 - 52 + 67- 2(5)(0)cos C " Reflect in ePortfolio 64 25 + 36 - 60 Cos C Part At Find a pair of similar tre 64 = 01 -60 cos C Him 3 60 cos C COS C- 0 - - 0.05. so O AIDE Questions C = cos 1( -0.05) ~ 92.90 DAUBC A 100 foot vertical ton Notice that since the cosine function is positive for acute angles our answer to the newles tenth of a degree to solve for an angle and we have to consider two possibilities unlike when we use the law of sines DABCDA DAMCD Consider the triangle with side lengths 4. 20. and 7 meters. Part B: Find the length DE 10 m Hint DE- Part A: Find the angle of Question Help: 2 Message in Answer: Part B: Find the largest angle of this triangle. Ro Hint Answer: Question Help: M 2_13A_Practice ~ . Question 2 RF2_13A_Practice An observer in a building is looking out of a window at another building across the street. The Score: ous or5 answered le of 40 to the tool of the other building, and an angle of 70 to its bas . Question : " where both angles are measured from the horizontal, as shown in the diagram. The buildings are 80 the top of a tall tree. If the observer is standing tween the ground and the line of sight Calculator observer 40 " Reflect in ePortfolio Task: View this topic Part A: What is the height of the obse Answer: Part B: How tall is the building across fro Answer: Part B : compute the length Hint stion Help: Calculator Answer. Submit Question Question Help: Message instructor
