Figure P1.14 shows a frustum of a cone. Of the following mensuration (geometrical) expressions, this describes (a) The total circumference of the flat circular faces (b) The volume (c) The area of the curved surface? (i) π (r 1 + r 2) [h2 + (r 1 - r 2)2]1/2 (ii) 2π (r 1 + r 2) (iii) πh (r 12 + r 1r 2 + r 22).