 | Euclid - 1845 - 328 σελίδες
...quadrilateral such that BC = AD and AC = BD ; if AC, BD meet in O, show that OA = OB. 39. PROP. 1 2. If, at a point in a straight line, two other straight lines on opposite sides of it make the adjacent angles together equal to two right angles, those two straight... | |
 | Great Britain. Parliament. House of Commons - 1852 - 192 σελίδες
...SECTION I. 1. If at a point in a given straight line, two other straight lines on the opposite side of it make the adjacent angles together equal to two right angles, these straight lines are in one and the same straight line. 2. To describe a square which shall be... | |
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If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line. 
