Let $D$ Be a Region Bounded by a Simple Closed Path $C$

question 20

Multiple Choice

Let $D$ be a region bounded by a simple closed path $C$ in the $x y$ . Then the coordinates of the centroid $( \bar { x } , \bar { y } )$ of $D$ are $\bar { x } = \frac { 1 } { 2 A } \oint _ { C } x ^ { 2 } d y , \bar { y } = - \frac { 1 } { 2 A } \oint _ { C } y ^ { 2 } d x$ where $A$ is the area of $D$ .
Find the centroid of the triangle with vertices $( 0,0 ) , ( 5,0 )$ and $( 0,10 )$ .

• A) \(\left( \frac { 1 } { 8 } , \frac { 1 } { 8 } \right)\)
• B) \(\left( \frac { 10 } { 3 } , \frac { 10 } { 3 } \right)\)
• C) \(\left( \frac { 1 } { 10 } , \frac { 1 } { 5 } \right)\)
• D) \(\left( \frac { 5 } { 3 } , - \frac { 10 } { 3 } \right)\)
• E) \(\left( \frac { 1 } { 8 } , \frac { 1 } { 64 } \right)\)

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