By Rotating The Line Y Mx About The X Axis For 0 A X B We Obtain A Truncated Cone 3177452

By rotating the line y = mx about the x-axis for 0
(a) Show that the slant height of the cone is given by I = ./ 1 + m2 (b — a) and that the surface area then becomes7r ( ‘I( ,ri + = n + m2(b2 — a2). (b) Apply Equation 3 to the surface of revolution to obtain the same result for the surface area.