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1.The Trigometric Ratio 1 1. Given sin(90 - a) = ½ , find without using trigonometric tables the value of cos a (2mks) 2. If 4524tan,find without using tables or calculator, the value of sincoscostan(3 marks) 3. At point A, David observed the top of a tall building at an angle of 30o. After walking for 100meters towards the foot of the building he stopped at point B where he observed it again at an angle of 60o. Find the height of the building 4. Find the value of , given that ½ sin= 0.35 for 0o≤ θ ≤ 360o5. A man walks from point Atowards the foot of a tall building 240 m away. After covering 180m, he observes that the angle of elevation of the top of the building is 45o. Determine the angle of elevation of the top of the building from A6. The table below gives a field book showing the results of a survey of a section of a piece of land between A and E. All measurements are in metres. D33 C21 B 42 E 95 90 70 30 25 A F36 G 25 H40 (a) Draw a sketch of the land.