 | University of St. Andrews - 1898 - 610 pages
...prove that AB: AC::BD:BC. 5. If a straight line stand at right angles to each of two straight lines, at the point of their intersection, it shall also be at right angles to the plane in which they are. From a point P a perpendicular is drawn to a plane, meeting it at Q, and from Q... | |
 | University of St. Andrews - 1900 - 670 pages
...How can the fourth point of a harmonic range be found, when three points of the range are given ? 6. If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angles to their plane. The sum of the... | |
 | Mathematics - 1871 - 280 pages
...are the middle points of the sides and A,B,C the intersections of opposite sides. EUCLID XI., &c. I. If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angUs to the plane which passes through... | |
 | University of Cambridge - Universities and colleges - 1810 - 324 pages
...both by vulgar fractions and by decimals. 2. Prove, that if a straight line stand at right arigles to each of two straight lines in the point of their intersection, it .will be at right angles to the plane that passes through them. 3. Define a Rhombus ; and prove that... | |
| |
If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angles to the plane which passes through them, that is, to the plane in which they are. 
