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THE angles at the base of an isosceles triangle are equal to one another : and, if the equal sides be produced, the angles upon the other side of the base shall be equal.
The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ... - Page 19
by Robert Simson - 1806 - 518 pages

Selected Prose

Sir Max Beerbohm - 1970 - 390 pages

A Mathematics Sampler: Topics for the Liberal Arts

William P. Berlinghoff, Kerry E. Grant, Dale Skrien - Mathematics - 2001 - 602 pages
...according to Euclid's description in the proof. Proposition 5: The angles opposite the equal sides of an isosceles triangle are equal to one another; and, if the equal sides are extended further, the angles made with the third side will be equal. Proof: Let ABC be an isosceles...

The Sheet-Metal Worker's Instructor

R. H. Warn, John G. Horner - Technology & Engineering - 2002 - 284 pages
...drawn from the centre to the circumference of a circle are equal. (Euc. I. def. 30.) (6) The angles at the base of an isosceles triangle are equal to one another. (Euc. I. 5.) (c) The greater side of every triangle has the greater angle opposite to it. (Enc. I....

Studies in Modern Music: Frederick Chopin, Antonin Dvorak, Johannes Brahms 1926

W. H. Hadow - Music - 2004 - 332 pages