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A RC L ENGTH AND S URFACE A REA Compiled by Mrs. King

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S TART WITH SOMETHING EASY The length of the line segment joining points (x 0,y 0 ) and (x 1,y 1 ) is (x 1,y 1 ) (x 0,y 0 )

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T HE L ENGTH OF A P OLYGONAL P ATH ? Add the lengths of the line segments.

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T HE LENGTH OF A CURVE ? Approximate by chopping it into polygonal pieces and adding up the lengths of the pieces

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A PPROXIMATE THE CURVE WITH POLYGONAL PIECES ?

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W HAT ARE WE DOING ? In essence, we are subdividing an arc into infinitely many line segments and calculating the sum of the lengths of these line segments. For a demonstration, let’s visit the web.web

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T HE F ORMULA :

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A RC L ENGTH Note: Many of these integrals cannot be evaluated with techniques we know. We should use a calculator to find these integrals. phs.prs.k12.nj.us/preyes/Calculus%205-4.ppt

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E XAMPLE P ROBLEM Compute the arc length of the graph of over [0,1].

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N OW COMES THE FUN PART … First, press the Math button and select choice 9:fnInt( Next, type the function, followed by X, the lower bound, and the upper bound. Press Enter and you get the decimal approximation of the integral!

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E XAMPLE Find the arc length of the portion of the curve on the interval [0,1] phs.prs.k12.nj.us/preyes/Calculus%205-4.ppt

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Y OU TRY Find the arc length of the portion of the curve on the interval [0,1] phs.prs.k12.nj.us/preyes/Calculus%205-4.ppt

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S URFACE A REA Compiled by Mrs. King

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R EVIEW : Find the volume of the solid created by rotating about the x-axis on the interval [0,2] Picture from: hosters.com/2/2d/Basic_cubic_function_graph.gif

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S URFACE A REA OF S OLIDS OF R EVOLUTION When we talk about the surface area of a solid of revolution, these solids only consist of what is being revolved. For example, if the solid was a can of soup, the surface area would only include the soup can label (not the top or bottom of the can) phs.prs.k12.nj.us/preyes/Calculus%205-4.ppt

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W HAT ARE WE DOING ? Instead of calculating the volume of the rotated surface, we are now going to calculate the surface area of the solid of revolution

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T HE F ORMULA :

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E X 2.5 Find the surface area of the surface generated by revolving about the x-axis phs.prs.k12.nj.us/preyes/Calculus%205-4.ppt

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C LOSURE Hand in: Find the surface area of the solid created by revolving about the x- axis phs.prs.k12.nj.us/preyes/Calculus%205-4.ppt

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H OMEWORK Page #

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