Question: The surfaces r = 2 and 4, = 30 and 50, and = 20 and 60 identify a closed surface. Find (a) The

The surfaces r = 2 and 4, θ = 30° and 50°, and ϕ = 20° and 60° identify a closed surface. Find

(a) The enclosed volume;

(b) The total area of the enclosing surface;

(c) The total length of the twelve edges of the surface;

(d) The length of the longest straight line that lies entirely within the surface.

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