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Let the radius of the smaller upper plane of the frustrum be a, the radius of the larger lower plane of the frustrum be b, the vertical length of the frustrum be l, and the resistivity of the material be r.

I believe the equation

Resistance = Resistivity * Length / Cross-sectional Area

can be applied. Some integration and calculus will also be needed in solving this problem, but I do not know how to begin.

Should I take an elemental cross-sectional area of the wire and integrate?