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1inch 90degree elbow centre
22+14+8
To find the centre of a square or rectangular board, draw a diagonal line from corner to corner. Repeat for the remaining two corners. Both lines will cross over at the centre of the board.
put them in order and the middle one is the median
Centre of area for plane triangle (no thickness, theory only) Line from apex to middle of opposite side, repeat for another apex, intersection is centre of area. > If triangle has thickness go from centre of area vertically down to half thickness of material. This is the centre of mass or centroid