Set up and evaluate the definite integral for the area of the surface formed by revolving the graph of $y = \frac { x } { 2 } , 1 \leq x \leq 9$ about the $x$-axis.
A) $40 \sqrt { 5 } \pi$
B) $4 \sqrt { 5 } \pi$
C) $20 \sqrt { 5 }$
D) $4 \sqrt { 5 }$
E) $20 \sqrt { 5 } \pi$

Question

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The Answer of Set up and evaluate the definite integral for the area of the surface formed by revolving the graph of $y = \frac { x } { 2 } , 1 \leq x \leq 9$ about the $x$-axis.
A) $40 \sqrt { 5 } \pi$
B) $4 \sqrt { 5 } \pi$
C) $20 \sqrt { 5 }$
D) $4 \sqrt { 5 }$
E) $20 \sqrt { 5 } \pi$

Set Up and Evaluate the Definite Integral for the Area y=x2,1≤x≤9y = \frac { x } { 2 } , 1 \leq x \leq 9y=2x​,1≤x≤9

Set Up and Evaluate the Definite Integral for the Area $y = \frac { x } { 2 } , 1 \leq x \leq 9$