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Homework Help: Centroid of an irregular shape

  1. Nov 29, 2011 #1
    1. The problem statement, all variables and given/known data
    As part of a test I was given an irregular shape to find its centroid. It was a rectangle with a right angled triangle on its right side (I don't have a picture to upload for ye unfortunately).

    2. Relevant equations
    X(bar)=intrecal x.y.dx
    Y(bar)=intrecal y^2/2.dy

    3. The attempt at a solution
    I worked out the area and centroid of the rectangle and triangle separately but didn't know how to find the overall centroid. How would you do this?
  2. jcsd
  3. Nov 29, 2011 #2
    Compute the centroid of each part, xbar and ybar. Compute the area of each. Multiply each centroid, xbar and ybar, by its respective area. Then divide by the total area to get the location of XBAR and YBAR.

    By the way, xbar = (1/A)*integral (x*dA),
    ybar = (1/A)*integral (y*dA)
  4. Nov 29, 2011 #3
    Thank you.
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