9 [Volume of a pyramid = 1/3× base area × height] The diagram shows a pyramid with a rectangular, horizontal base. Vertex F of the pyramid is vertically above the centre of the base, E. AB = 6.2 cm and BC = 4.3 cm. The length of each sloping edge of the pyramid is 9.5 cm. (a) Show that the height, EF, of the pyramid is 8.72 cm, correct to 3 significant figures. (b) Calculate the volume of the pyramid. (c) Calculate angle AFB. (d) Calculate the angle of elevation of F from the midpoint of AB.