= 3.9 m and = 2.4 m. AB BC Calculate the length of AC. = m Answer AC ………..……… [2] 6. NOT TO SCALE represents a building with a vertical flagpole, on the roof. ABCD AF, The points and are on level ground. = 55 metres. E, D C EA The angle of elevation of from is 18° and the angle of elevation of from is 25°. A E F E (a) Calculate (i) ED, m Answer (a)(i) ……..………… [2] (ii) FD, m Answer (a)(ii) ……..………… [2] (iii) DA. Answer (a)(iii) ……….………… [2] (b) Show that = 7.4 metres, correct to 1 decimal place. AF Answer(b) ……..….….………… [1] (c) The width, of the building is 12 metres. AB, The top of the flagpole is attached to the point by a rope. B Calculate (i) the length of the rope, FB, m Answer (c)(i) ……..…….…… [2] (ii) the angle of elevation of from F B.
AB = 3.9 m and BC = 2.4 m. Calculate the length of AC. Answer AC = ………..……… m [2] 6. NOT TO SCALE ABCD represents a building with a vertical flagpole, AF, on the roof. The points E, D and C are on level ground. EA = 55 metres. The angle of elevation of A from E is 18° and the angle of elevation of F from E is 25°. (a) Calculate (i) ED, Answer (a)(i) ……..………… m [2] (ii) FD, Answer (a)(ii) ……..………… m [2] (iii) DA. Answer (a)(iii) ……….………… [2] (b) Show that AF = 7.4 metres, correct to 1 decimal place. Answer(b) ……..….….………… [1] (c) The width, AB, of the building is 12 metres. The top of the flagpole is attached to the point B by a rope. Calculate (i) the length of the rope, FB, Answer (c)(i) ……..…….…… m [2] (ii) the angle of elevation of F from B.
trigonometry-1.docx