1. Identify the triangle with the unknown length that can be determined using each formula. Explain how you know the formula you chose is correct. a) f=at+ M Zabcos C B F=a"+c Zaccos B d =P+ 2bccos A i B i) o =k G F 2. Write the formula you can use to determine the length of the unknown side in each triangle. Explain how you know your formula is correct. a) b) o N 4.4m F. Determine the length of the unknown side in cach triangle. p a} L by E ] ; : a OuET m o a q 45m 1.20m 190" F 42 cm i & Q A 1.6 Applying the Cosine Law 35 GETTTED T 4. A hiker walked 4.9 km due north from her campsite. M Then, she walked a further 5.8 km on a bearing of 110, How far from the campsite is she now? S 5.8 km 4.9km