| Thomas Franklin Holgate - Geometry - 1901 - 462 pages
...PLANES IN SPACE PROPOSITION IV 397. If a straight line is perpendicular to each of two given straight lines at their point of intersection, it is perpendicular to the plane of those lines. Let the straight line AO be perpendicular to both the straight lines BO and CO at their... | |
| George Albert Wentworth - Geometry, Solid - 1902 - 248 pages
...r > 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.... | |
| Alan Sanders - Geometry - 1903 - 396 pages
...perpendicular to every line of the plane that passes through its foot. PROPOSITION III. THEOREM 807. // a line is perpendicular to each of two lines at their point of intersection, it is perpendicular to their plane. Let AB be J_ to CD and to EF at their point of intersection B. To Prove AB _L to the plane... | |
| George Albert Wentworth - Geometry - 1904 - 496 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.... | |
| Fletcher Durell - Geometry - 1911 - 553 pages
...planes ? PROPOSITION I. THEOREM 509, If a straight line is perpendicular to each of tivo oilier straight lines at their point of intersection, it is perpendicular to the plane of those lines. Given AB JL lines BC and BD, and the plane MN passing through BC and BD. To prove AB _L... | |
| Fletcher Durell - Geometry, Solid - 1904 - 232 pages
...GEOMETRY V PROPOSITION I. THEOREM 509. 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 those lines. Given AB _L lines BC and BD, and the plane MN passing through BC and BD. To prove AB J.... | |
| Education - 1919 - 960 pages
...subject, namely a model to illustrate the theorem: If a line is perpendicular to each of two other lines at their point of intersection it is perpendicular to the plane of the two lines. This model is made according to specifications, insuring uniformity, and I make a freehand sketch on... | |
| Education - 1919 - 924 pages
...subject, namely a model to illustrate the theorem: If a line is perpendicular to each of two other lines at their point of intersection it is perpendicular to the plane of the two lines. This model is made according to specifications, insuring uniformity, and I make a freehand sketch on... | |
| Charles Davison - Geometry, Solid - 1905 - 140 pages
...PERPENDICULAR TO PLANES. 9. PROP. 8. If a straight line be perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane containing them*. Let OA be perpendicular to each of the lines OB, OC at their point of intersection... | |
| David Eugene Smith - Geometry - 1911 - 360 pages
...will frequently be seen. THEOREM. If a strau)ht 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. If students have trouble in visualizing the f,gure in three dimensions, some knitting needles through... | |
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