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Determine the centroid of a lamina remaining after a rectangle is removed from a larger rectangle, and calculate the distance of this centroid from specific edges.

Mathematics

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Step-by-step solution

2 steps

To solve this problem, we first need to find the centroid of the remaining lamina. We'll use the principle of composite areas.

Part (a): The distance from AB and AD of the centroid of the remainder of the lamina.

  1. Define a coordinate system.

    Let point A be the origin $(0,0)$.
    The side AB lies along the x-axis.
    The side AD lies along the y-axis.

  2. Calculate the area and centroid for each component shape.

    • Rectangle ABCD:
      • Length AB=8aAB = 8a, Width AD=4aAD = 4a.
      • Area $A_R = (8a)(4a) =
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