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I have a simple question on the set-up of a triangular prism.

Strang, Ch. 8: Applications of the Integral

pdf page 4 (bottom) and correlates with example 5 on pdf page 5

http://ocw.mit.edu/ans7870/resources/Strang/Edited/Calculus/8.1-8.3.pdf [Broken]

How is he getting the length of [tex]1-\frac x h[/tex]

Strang, Ch. 8: Applications of the Integral

pdf page 4 (bottom) and correlates with example 5 on pdf page 5

http://ocw.mit.edu/ans7870/resources/Strang/Edited/Calculus/8.1-8.3.pdf [Broken]

How is he getting the length of [tex]1-\frac x h[/tex]

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