T. Sundara Row's Geometric exercises in paper folding; (1901)
Sundara Rao, T. (Tandalam), b. 1853 · Chicago, The Open court pub. company; [etc., etc.] · leaf 30
IN PAPER FOLDING n of the sides upon the base. We thus obtain the three altitudes of the triangle, viz.: A A', BB', CC, (Fig. 11). 27. Each of the altitudes divides the triangle into two congruent right-angled triangles. 28. They bisect the sides at right angles. … Fig. ii. 29. They pass through a common point. 30. Let the altitudes A A' and CC' meet in O. Draw BO and produce it to meet AC in B '. BB' will now be proved to be the third altitude. From the triangles C'OA and COA', OC' = OA'. From triangles OC'B and A' OB, / OBC =-. ^A'BO. Again from triangles…
Geometry -- Study and teaching · Paper work
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