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Published online by Cambridge University Press: 20 January 2009
The theorem is:—If a1, a2, a3, …, a22 be the middle points of the sides of any convex polygon A1A2A3…A2n then as regards areas
The following proof depends only on the theorem that the line joining the points of bisection of two sides of a triangle cuts off a triangle equal in area to a quarter of the original triangle.