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IF two parallel planes be cut by another plane, their common sections with it are parallels.* Let the parallel planes AB, CD be cut by the plane EFHG, and let their common sections with it be EF, GH ; EF is parallel to GH.
A course of geometrical drawing - Page 73
by William Schofield Binns - 1861
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## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1806 - 320 pages
...through DE, EF, and has been proved to be perpendicular to the plane through AB, BC. m. PROP. XIV. THEOR. IF two parallel planes be cut by another plane, their common sections with it are parallel. Let the parallel planes AB, CD be cut by the plane EFHG, and let their common sections with it be EF,...
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## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1806 - 518 pages
...Wherefore, if two straight lines, &c. QED c 3. def. 11. d 9. 11. Book XI. PROP. XVI. THEOR. See N. IF two parallel planes be cut by another plane, their common sections with it are parallels. Let the parallel planes AB, CD be cut by the plane EFHG, and let their common sections with...
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## The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1814 - 558 pages
...parallel to the plane through DE, EF. Wherefore if two straight lines, &c. QED Borne PROP. XVI. THEOR. lT two parallel planes be cut by another plane, their common sections with it are parallels. Let the parallel planes AB, CD be cut by the plane EFHG, and let their common sections with...
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## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclides - 1816 - 528 pages
...parallel to the plane through DE, EF. Where/one if two straight lines, &c. QED PROP. XVI. THEOR. See N. If two parallel planes be cut by another plane, their common sections with it are parallels. . Let the parallel planes AB, CD be cut by the plane EFHG, and let their common sections...
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## Pantologia. A new (cabinet) cyclopędia, by J.M. Good, O. Gregory ..., Volume 5

John Mason Good - 1819 - 740 pages
...plane which passes through these is parallel to the plane pasting through the other*. Prop. XVI. Theor. If two parallel planes be cut by another plane, their common sections with it are parallels. Prop. XVII. Theor. If two straight lines be cut by parallel planes, they shall be cut in...
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## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

Euclid, John Playfair - Circle-squaring - 1819 - 348 pages
...be perpendicular to one of them, it must be perpendicular to the other also. PROP. XIV. THEOR. B G If two parallel planes be cut by another plane, their common sections with it are parallels. Let the parallel planes AB, CD be cut by the plane EFHG, and let their common sections with...
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## Elements of Geometry: Containing the First Six Books of Euclid: With a ...

John Playfair - 1819 - 317 pages
...perpendicular to one of them, it must be perpendicular to the other also. PROP. XIV. THEOR. ff t-eo parallel planes be cut by another plane, their common sections with it are parallels. Let the parallel planes AB, CD be cut by the plane EFHG, and lei their common sections with...
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## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - 1835 - 540 pages
...to the plane through DE, EF. Wherefore, " if two straight lines," &c. QED See N. PROP. XVI. THEOH. If two parallel planes be cut by another plane, their common sections with it are parallels. Let the parallel planes AB, CD be cut by the plane EFHG, and let their common sections with...
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## The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

Mathematics - 1836 - 472 pages
...plane which passes through the first two is parallel to the plane riassing through the others. XIV. If two parallel planes be cut by another plane, their common sections with it are parallels. XV. If two parallel planes be cut by a third plane, they have the same inclination to that...
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## Elements of Geometry: Containing the First Six Books of Euclid : with a ...

John Playfair - Geometry - 1837 - 332 pages
...perpendicular to one of them, it must be perpendicular to the other also. 189 ^x B c PROP. XIV. THEOR. If two parallel planes be cut by another plane, their common sections with it are parallels. Let the parallel planes AB, CD, be cut by the plane EFHG, and let their common sections...
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