For centroids pt. 2, my group and I used the effects of gravity to help locate the position of our shape's centroid. We attached a piece a weighted string to a point on the shape's perimeter, and then attached that to a wall. When both the shape and the string were allowed to hang freely, the string overlapped the centroid somewhere along its length. By repeating this process three times, we were able to determine the location of the centroid by seeing where the strings intersected.
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