| John Playfair - 1806 - 311 pages
...Therefore, if two planes, &c. QED A PROP. IV. THEOR. a 2. 6. 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. Let the straight line AB stand at right... | |
| Euclid, Robert Simson - 1806 - 518 pages
...line. Wherefore, if two planes, &c. QED PROP. IV. THEOR. SeeN. IF a straight line stand at right angles **to each of two straight lines in the point of their intersection, it** shall also be at ri^ht angles to the plane which passes through them, that is, to the plane in which... | |
| John Mason Good - 1813
...their common section is a straight line. Piop. IV. Theor. If a straight line stand at right angles **to each of two straight lines in 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... | |
| Euclides - 1816 - 528 pages
...ThereforeAFis perpendicular to each of the straight lines GH, DE. But if a straight line stands at right angles **to each of two straight lines in the point of their intersection, it** shall also be at right angles to the plane passing through them. But the plane passing through ED,... | |
| John Playfair - 1819 - 333 pages
...section of these planes. Therefore, &c. Q,. ED PROP. IV. THEOR. 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. Let the straight line AB stand at right... | |
| John Playfair - 1819 - 317 pages
...perpendicular to each of the straight lines GH, DE. But if* a straight line stands 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 (4. 2. Sob.). And the plane passing through... | |
| 1821 - 425 pages
...yards lx>th by vulgar fractions and by decimals. 2. Prove that if a straight line stand at right angles **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 (a) be the first term, and (i) the sum of three terms of a geometric progression,... | |
| Peter Nicholson - 1825 - 372 pages
...if perpendicular to each of the straight lines GH, DE. But if a straight line stands at right anglei **to each of two straight lines in the point of their intersection, it** shall also be at right angles to the plane passing through them. But the plane passing through ED,... | |
| Robert Simson - 1827 - 513 pages
...Wherefore, if two planes, &c. Q. E, D. PROP. IV. THEOR. See N. If a straight line stand at right angles **to each of two straight lines in 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... | |
| Euclid, Robert Simson - 1835 - 513 pages
...Wherefore, " if two planes" &c. QED L. 'A PROP. IV. THEOR. See N. If a straight line stand at right angles **to each of two straight lines in the point of their intersection,** if shall also be at right angles to the plane which passes through them, that is, to the plane in which... | |
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