Problem: The figure shows a frustrum of a cone. Match each of the expressions (a) π(r1 + r2)[h2 + (r2 − r1)2]1/2 (b) 2π(r1 + r2) and (c) πh(r12 + r1r2 + r22)/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

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The figure shows a frustrum of a cone. Match each of the expressions (a) π(r₁ + r₂)[h² + (r₂ − r₁)²]^1/2 (b) 2π(r₁ + r₂) and (c) πh(r₁² + r₁r₂ + r₂²)/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