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Volume of a Torus

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Calculate the volume and surface area of a torus (doughnut-shaped solid) using its inner and outer radii.
Inner Radius a
Outer Radius b
b≧a
Volume V 
Surface Area S 
\(\normalsize Torus\\ (1)\ volume:\hspace{50px} V={\large\frac{1}{4}}\pi^2(a+b)(b-a)^2\\ (2)\ surface\ area:\hspace{10px} S=\pi^2(b^2-a^2)\\\)

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