Elements of plane and spherical trigonometry (1833)
Young, J. R. (John Radford), 1799-1885 · Philadelphia, Carey, Lea & Blanchard · leaf 137
A is thepole of be, the arcs aG, AH, are quadrants. Hence, aQ-\- AH = oH.-\- AG = IT, and the angles at G and H are right angles. / Let R, R, be the intersections of BC, he ; then, because xUe angles atG and H are right, R, R, are the poles of a A. Let AB meet be in K, BC meet ab inL, AC meet be in… … the poles AM and CK. Hence the propositions as stated aretrue. These are due to Professor Tiovny, andwere given by him, in 1800, in LeybournsRepos. old series. No. 1, p. 44, 5. Theyhave not, that we are av^are, been no-ticed in any other place. Returning now to our original figure, let the three…
