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### Beliebte Passagen

Seite 177 - ... if a straight line, &c. QED PROPOSITION 29. — Theorem. If a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another ; and the exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same side together equal to two right angles.
Seite 31 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line. Let...
Seite 185 - If a straight line meets two straight lines, so as to make "the two interior angles on the same side of it taken " together less than two right angles...
Seite 196 - BAG is a right angle (Def. 30.), the two straight lines AC, AG upon the opposite sides of AB, make with it at the point A the adjacent angles equal to two right angles; therefore CA is in the same straight line (i.
Seite 38 - Any side of a triangle is less than the sum of the other two sides...
Seite 157 - To describe an isosceles triangle, having each of the angles at the base double of the third angle.