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 112
94 EUCLIDS ELEMENTS. Proposition 48. Theorem. If the square described on one side of a triangle be equal tothe sum of the squares described on the other two sides, then theangle contained by these two sides shall be a right angle.
Geometry · Mathematics
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