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calculus - How does $dV=2\pi R^2t \sin \theta\, d\theta$ come? - Mathematics Stack Exchange
Area of a Circle - Definition, Formula, Derivation, and Examples
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Let R be the region between the graphs of y=1 and y=sinx from x=0 to x=pi/2, how do you find the volume of region R revolved about the x-axis? | Socratic
Area and Circumference of a Circle - ppt download
Solve the Quadratic Equation A = pi*r^2 for r - YouTube
calculus - Show that the volume of a sphere of radius $r$ is $V = \frac{4}{3} \pi r^3$ - Mathematics Stack Exchange