![]() ![]() The Elements also include the following five "common notions": : That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which the angles are less than two right angles.Īlthough Euclid explicitly only asserts the existence of the constructed objects, in his reasoning he also implicitly assumes them to be unique.That all right angles are equal to one another.To describe a circle with any centre and distance (radius). ![]()
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