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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).

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