If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, and the exterior angle equal to the interior and opposite angle on the same side; and also the two interior angles on the same side together equal... A companion to Euclid: being a help to the understanding and remembering of ... - Side 27 av Euclides - 1837 - 88 sider Uten tilgangsbegrensning -
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