Is this a disk or washer method?

The curves of y = f (x) and y = g(x) intersect when x = a and x = b, and f (x) g(x) 0 for all x on (a, b). The volume obtained when the region bounded by the curves is rotated about the x-axis.

I'm trying to find the integral expression for this problem, but I can't tell whether it's a disk or a washer.

Question

Is this a disk or washer method?

The curves of y = f (x) and y = g(x) intersect when x = a and x = b, and f (x) > g(x) > 0 for all x on (a, b). The volume obtained when the region bounded by the curves is rotated about the x-axis.

I'm trying to find the integral expression for this problem, but I can't tell whether it's a disk or a washer.

jtvatsim · Answer

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anonymous · Answer

That makes it so much clear! So it's a washer!

jtvatsim · Answer

Perfecto!

jtvatsim · Answer

Drawing a picture always makes the problem so much easier! Show yourself the answer. :)

anonymous · Answer

I think it's supposed to be... |dw:1395358948128:dw|