The volume of a solid of revolution
The volumes of solids formed by the revolution of a curvilinear trapezoid [bounded by the curve y=f(x), the x-axis and two vertical lines x=a and x=b ] about the x-axis and y-axes are expressed, respectively, by the formulas:
and .
The Area of a Surface of Revolution
The area of a surface formed by the rotation, about the x-axis, of an arc of the curve y=f(x) between the points x=a and x=b, is expressed by the formula
.
If a curve is represented by equations in parametric form then ,
where and are values of the parameter t.
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