Text-book of Euclid's elements for the use of schools : books I - VI and XI (1900)
Hall, H. S. (Henry Sinclair), 1848-1934, Stevens, F. H. (Frederick Haller), 1853-1933 · MacMillan : London · leaf 463
And in the A8 DAC, EAC, because DA, AC = EA, AC respectively, Constr. but DC is greater than EC \ Proved. .-. the L DAC is greater than the L EAC. I. 25. But the l BAD = the l BAE ; Constr. .*. the two z_8 BAD, DAC are together greater than the L BAC. Q.E.D. Proposition 21. Theorem. Every (convex)… … Let the solid angle at S be formed by the plane l.s ASB,BSC, CSD, DSE, ESA. Then shall the sum of these plane angles be less than fourrt. angles. hook xi. prop. 21. 443 For let ;i plane XY intersect nil the arms of the planeangles on the same side of the vertex at the points a, b, c, D, E: and let…
Geometry · Mathematics
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