Elements of mechanics: treated by means of the differential and integral calculus (1887)
Peck, William G[uy], 1820-1892. [from old catalog] · New York, Chicago, A. S. Barnes & company · leaf 71
joining themiddle points of the opposite sides. It is to be remarked, that this point coincides with thepoint of intersection of the diagonals of the parallelogram. Centre of Gravity of a Trapezoid. 57. Let AC he sl trapezoid. Join the middle points,0 and P, of the parallel sides, by a straight… … CENTRE OF GRAVITY. 67 OQ = \OD, and PR = \PB ; then will Q and R bethe centres of gravity of these triangles (Art. 55). JoinQ and J? by a straight line; the centre of gravity of thetrapezoid must be on this line (Art. 52). Hence, it is atG where the line QR cuts OP. Centre of Gravity of a Polygon.…
Mechanics
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