 | James Howard Gore - Geometry - 1898 - 232 pages
...perpendicular. PROPOSITION III. THEOREM. 337. If a straight line is perpendicular to each of two straight lines at their point of intersection it is perpendicular to the plane of those lines. To prove that BA is perpendicular to EA and hence perpendicular to MN. Make AC equal to... | |
 | 1898 - 870 pages
...lines they are cut proportionally. 4. îf a straight line is perpendicular to each of two straight lines at their point of intersection it is perpendicular to the plane in which they lie. Find the locus of a point equidistant from two given points. II. 1. Shew how to... | |
 | George Albert Wentworth - Geometry - 1899 - 498 pages
...GEOMETRY. PROPOSITION II. THEOREM. 507. If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines. Let AB be perpendicular to BC and BD at B. To prove that AB is A. to the plane MN of these lines. Proof.... | |
 | George Albert Wentworth - Geometry, Solid - 1899 - 246 pages
...GEOMETRY. PROPOSITION II. THEOREM. 507. If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines. Let AB be perpendicular to BC and BD at B. To prove that AB is _L to the plane MN of these lines. Proof.... | |
 | William James Milne - Geometry - 1899 - 396 pages
...reference to the plane? Theorem. If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines. Data : Any two straight lines, as AB and CD, intersecting at E; MN, the plane of these lines ; and... | |
 | Education - 1899 - 658 pages
...we could not cross. GEOMETRY. 1. If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines. 2. The radius perpendicular to a chord bisects the chord and the arc subtended bv it. 3. The bisectors... | |
 | George Albert Wentworth - Geometry - 1899 - 500 pages
...PROPOSITION- II. THEOREM. 507. If a straight line vs perpendicular to each of two other straight lines af their point of intersection, it is perpendicular to the plane of the two lines. F Let AB be perpendicular to BC and BD at B. To prove that AB is _L t» the plane MN of these lines.... | |
 | Arthur Schultze, Frank Louis Sevenoak - Geometry - 1901 - 396 pages
...parallel if they do not meet, however far they may be produced. PROPOSITION II. THEOREM 461. If a straight line is perpendicular to each of two lines at their...intersection, it is perpendicular to the plane of those lines. Hyp. AB is J. to BC and BD at B. To prove AB is J. to the plane MN containing BC and BD.... | |
 | Arthur Schultze, Frank Louis Sevenoak - Geometry - 1902 - 394 pages
...parallel if they do not meet, however far they may be produced. PROPOSITION II. THEOREM 461. If a straight line is perpendicular to each of two lines at their...intersection, it is perpendicular to the plane of those lines. Hyp. AB is -l. to BC and BD at B. To prove AB is -l. to the plane MN containing BC and... | |
 | Arthur Schultze, Frank Louis Sevenoak - Geometry - 1901 - 394 pages
...parallel if they do not meet, however far they may be produced. PROPOSITION II. THEOREM 461. If a straight line is perpendicular to each of two lines at their...intersection, it is perpendicular to the plane of those lines. Hyp. AB is -L to BC and BD at B. To prove AB is -L to the plane MN containing BC and BD.... | |
| |
If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines. 
