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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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Woolwich Mathematical Papers for Admission Into the Royal Military Academy ...

E. J. Brooksmith - Mathematics - 1889 - 356 pages
...angles to each of them at that point ; these three straight lines are in one and the same plane. 2. If two parallel planes be cut by another plane, their common sections with it are parallels. 3. Find a point, at a given distance from a given plane, equidistant from three given points...
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Manual

1903 - 898 pages
...middle point of the opposite side, show that the vertex must lie on a certain circle. 6. Show that if two parallel planes be cut by another plane their common sections with it are parallel. 7. Find the numerical value of the ratio between a side and a diagonal of a regular pentagon. log 3...
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Examinations Papers

1879 - 636 pages
...equiangular to one another, and shall have those angles equal which are opposite to homologous sides. 4. If two parallel planes be cut by another plane, their common sections with it are parallel. II. — 1. Define the sine, cosine, and tangent of an angle greater than one right angle but less than...
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Journal, Volume 13

Industrial arts - 1865 - 564 pages
...two straight lines be at right angles to the same plane they shall be parallel to one another. 12. If two parallel planes be cut by another plane their common sections with it are parallel. PROBLEMS. 1. Construct a right-angled triangle, having given the perimeter and one angle. 2. Bisect...
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Calendar

University of Cambridge - 1855 - 682 pages
....D, E respectively ; shew that it' BE, CD intersect in F, AF is parallel to the tangents BD, CE. 7. If two parallel planes be cut by another plane, their common sections with it are parallels. From the extremities of the two parallel straight lines AB, CD, parallel lines Aa, Bb, Ce,Dd...
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