 | Euclides - 1865 - 402 pages
...line. Wherefore, if two planes, &c. QED PROP. IV. — THEOREM. // a straight line stand at right angles to each of two straight lines in the point of their intersection ; then it shall also be at right angles to the plane which passes through them, that is, to the plane... | |
 | Robert Potts - 1868 - 434 pages
...is perpendicular to each of the straight lines GH, DE. But if a straight line stand at right angles to each of two straight lines in the point of their intersection, it is also at right angles to the plane passing through them : (xI. 4.) but the plane passing through... | |
 | Robert Potts - 1876 - 446 pages
...AFis perpendicular to each of the straight lines GH, DE. But if a straight line stand at right angles to each of two straight lines in the point of their intersection, it is also at right angles to the plane passing through them : (xi. 4.) but the plane passing through... | |
 | Canada. Department of the Interior - 1888 - 756 pages
...angles, any two of these angles are greater than the third. 4. If a straight line stand at right angles to each of two straight lines in the point of their intersection it will also be at right angles to the plane in which these lines are. -6. How many yards of cloth are required... | |
 | University of Cambridge - 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...that the diagonals of a rhombus bisect each other at right angles. 4. If («)be the first term, and (b) the sum of three term* of a geometric progression,... | |
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AF is perpendicular to each of the straight lines GH, DE. But if a straight line stand at right angles to each of two straight lines in the point of their intersection, it is also at right angles to the plane passing through them : (xi. 
