SOLUTION: Find the surface area of a torus (doughnut) obtained by rotating the circle (x-b)^2+y^2 = a^2 about the y-axis.

SOLUTION: Find the surface area of a torus (doughnut) obtained by rotating the circle (x-b)^2+y^2 = a^2 about the y-axis.

Algebra.Com

Question 341303: Find the surface area of a torus (doughnut) obtained by rotating the circle (x-b)^2+y^2 = a^2
about the y-axis.
Answer by galactus(183) (Show Source): You can put this solution on YOUR website!
The center of the circle is b units from the origin. The circle has radius a.
The circle has circumference
It travels a distance around the y-axis.
By the Second Theorem of Pappus:
the surface area is
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