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The figure shows a frustrum of a cone. Match each of the expressions (a) π(r_{1} + r_{2})[h^{2} + (r_{2} − r_{1})^{2}]^{1/2} (b) 2π(r_{1} + r_{2}) and (c) πh(r_{1}^{2} + r_{1}r_{2} + r_{2}^{2})/3 with the quantity it describes: (1) the total circumference of the flat circular faces (2) the volume or (3) the area of the curved surface