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If two triangles have one angle of the one equal to one angle of the other, and the sides about the equal angles proportionals, the triangles shall be equiangular, and shall have those angles equal which are opposite to the homologous sides.
The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ... - Σελίδα 161
των Euclid - 1810 - 518 σελίδες
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...For the same reason, the angle ACB is equal to the angle DFE, and tbe angle at A, to the angle at D. Therefore the triangle ABC is equiangular to the triangle DEF. Wherefore, if the sides, Ike. QED PROP. VI. THEOR. IF two triangles have one angle of the one equal to one angle...

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...the angle BAG is equal to the angle EDF (Hyp.) ; wherefore also the remaining angle at B is equal to the remaining angle at E. Therefore the triangle ABC...to the triangle DEF. Wherefore, if two triangles, &e. QED PROP. VII. THEOR. If two triangles have one angle of the one equal to one angle of the other,...