2spirospanagiotis

Math Basic Geometry. Unit: Volume and surface area. Volume of a Cone. How does he solve for r^2

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131cm^3 = 1/3 * π * 5cm * r^2 i don't understand how he solves for r^2 and it isn't apparent to me. I am sorry if i shouldn't be posting this question here but i don't know where else to ask. link ...

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