Take any quadrilateral such as ABCD above. Construct the midpoints of each side and join them to form another quadrilateral EFGH. Varignon's Theorem asserts that the ...
THE objection to Duchayla's proof of the “parallelogram of forces” is, I suppose, admitted by all mathematicians. To base the fundamental principle of the equilibrium of a particle on the ...
I HAVE read with much interest the new proof given by Mr. W. E. Johnson of “ the parallelogram of forces,” in NATURE of December 19 (p. 153), and regard it as deserving a place among the best proofs ...
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