 | George Albert Wentworth - Geometry - 1904 - 496 pages
...SOLID 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... | |
 | Fletcher Durell - Geometry - 1911 - 553 pages
...different 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... | |
 | Fletcher Durell - Geometry, Solid - 1904 - 232 pages
...SOLID 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... | |
 | William Chauvenet - 1905 - 336 pages
...greater distance from the foot of the perpendicular. PROPOSITION IV.—THEOREM. 10. If a strait/hi line is perpendicular to each of two straight lines...of intersection, it is perpendicular to the plane of those lines. Let AP be perpendicular to PB and PC, at their intersection P; then .APIs perpendicular... | |
 | Charles Davison - Geometry, Solid - 1905 - 140 pages
...LINES 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... | |
 | 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... | |
 | Education - 1919 - 956 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... | |
 | 1907 - 796 pages
...the base and that contained by the sides of the triangle. 7. If a straight line be at right angles to each of two straight lines at their point of intersection, it is perpendicular to the plane in which they lie. AS and BC are two straight lines at right angles, and AP is a straight line at right angles... | |
 | Royal Military Academy, Woolwich - Mathematics - 1909 - 444 pages
...spire being at the same level, determine the height of the spire. 7. Prove that a straight line which is perpendicular to each of two straight lines at their point of intersection is perpendicular to the plane containing them. 8 8. Prove that, if each of the edges of a tetrahedron... | |
 | David Eugene Smith - Geometry - 1911 - 358 pages
...geometry, as will frequently be seen. 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. If students have trouble in visualizing the figure in three dimensions, some knitting... | |
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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. 
