# Volumes of Solids of Revolution (part 4 of 4)

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## Objective

SWBAT compute volumes of solids revolved around horizontal and vertical lines. SWBAT derive the volume formulas for spheres and cones using solids of revolution.

#### Big Idea

Why is a sphere’s volume 4/3 pi*r^3 ? Why is a cone’s volume 1/3 pi*r^2*h? How can we split a solid into thirds? Calculus has the answers.

35 minutes

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3 minutes