The figures below are graphs of r(u, v) = ui+ sin u cos vj + sin u sin vk, where 0 ≤ u ≤ π/2 and 0 ≤ v ≤ 2π. Match each
of the graphs with the point in space from which
the surface is viewed. The points are (10, 0, 0),
(-10, 10, 0), (0, 10, 0), and (10, 10, 10).

(a)

(b)

(c)

(d)

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