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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 15
by Robert Simson - 1806 - 518 pages
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A Christmas Garland

Sir Max Beerbohm - Parodies - 1922 - 197 pages
...thought of the past. If Euclid were alive to-day (and I dare say he is) he would not say, " The angles at the base of an isosceles triangle are equal to one another." He would say, "To me (a very frail and fallible being, remember) it does somehow seem that these two...
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American Photography, Volume 4, Issues 1-6

Photography - 1910
...Euclid in itself is not of much practical use — no one wants to prove in everyday life that the angles at the base of an isosceles triangle are equal to one another or that the three angles of a triangle are equal to two right angles, but you learn Euclid in order...
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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...
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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....
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