The length of a piece of cardboard is five inches more than the width. The four corners are cut off so that the sides can be folded up to form a box. Each of the cut corners measures one and a half inches by one and a half inches, and the volume of the box is 189 cubic inches. What are the original dimensions of the piece of cardboard?

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Animation Source: http://www.mathdemos.org/mathdemos/washermethod/ Narrated & edited by: Stacey Roshan

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How to use the arc length formula to calculate the length of a curve specified in polar form. This is Chapter 5 Problem 5 from the MATH1231/1241 Calculus notes. Presented by Ms. Anna Tomskova from UNSW Australia