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Volume of a Truncated Cone

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Calculate the volume, lateral surface area, and total surface area of a frustum of a cone using the radii of its base and top and its height.
Base radius r1
Radius of the top face r2
Height h
Volume V 
Lateral Surface Area F 
Surface Area S 
\(\normalsize Circular\ truncated\ cone\\ (1)\ volume:\hspace{10px} V={\large\frac{1}{3}}\pi({r_1}^2+r_1r_2+{r_2}^2)h\\ (2)\ lateral\ area:\\ \hspace{90px} F=\pi(r_1+r_2)\sqrt{(r_1-r_2)^2+h^2}\\ (3)\ surface\ area:\\ \hspace{90px} S=F+\pi({r_1}^2+{r_2}^2)\\\)

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