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The centroid of a plane area is found by

  • A.taking the mean of the extreme coordinates of the region
  • B.dividing the first moment of area by the area itself
  • C.dividing the area by its first moment
  • D.differentiating the area with respect to each coordinate

Answer: B

The coordinate of the centroid is \( \bar{x} = \left(\int x\,dA\right)/\left(\int dA\right) \), a weighted mean in which each element of area is weighted by its distance. Averaging the extreme coordinates would locate the centre of the bounding box, which coincides with the centroid only for a symmetric region

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