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If, from the ends of the side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than, the other two sides of the triangle, but shall contain a greater angle. Let...
A complete set of male pupil teachers' examination questions in Euclid [book ... - Σελίδα 8
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....Therefore any two sides, &c. QED PROP. XXI. THEOR. TF, from the ends of the side of a triangle, there he drawn two straight lines to a point within the triangle,...the triangle, but shall contain a greater angle.* Let the two straight lines BD, CD be drawn from B, C, the ends of the side BC of the triangle ABC,...