| Euclid - 1845 - 336 pages
...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...adjacent angles together equal to two right angles,** those two straight lines are in the same straight line. c B 'E Let BC, BD be two straight lines drawn... | |
| 130 pages
...circle centre O, and D is the mid-point of AB ; show that OD is perpendicular to BC. 25. PROP. 12. **If, at a point in a straight line, two other straight...adjacent angles together equal to two right angles,** those two straight lines are in the same straight line. Let BC, BD be two straight lines drawn from... | |
| British Columbia. Superintendent of Education - 1897 - 710 pages
...the number? GEOMETRY. 1. (a.) 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** must be in one and the same straight line. (b.) Give the enunciations of propositions that prove the... | |
| Great Britain. Parliament. House of Commons - Great Britain - 1852 - 192 pages
...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 equal... | |
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