1 The scale drawing shows three airfields, A, B and C, with B due north of A. The scale is 1 cm to 20 km. (a) Find the actual distance between A and B. (b) A beacon, D, is to the west of the line AB. It is 100 km from A and 120 km from B. Construct the position of D on the scale drawing. (c) Measure the bearing of C from B. (d) An aircraft is • equidistant from A and C, • 90 km from B. (i) By constructing suitable loci, mark on the diagram the two possible positions, P and Q, of the aircraft. (ii) Given that the aircraft is east of the line AB, find, by measuring, its bearing from C.