 | Raleigh Schorling, William David Reeve - Mathematics - 1922 - 460 pages
...quadrilateral in space are joined in order, the lines joining the midpoints form a parallelogram. 7. If a line is perpendicular to one of two parallel planes, it is perpendicular to the other plane. 8. If a line is perpendicular to a line of a plane, is it perpendicular to the plane ? 9. From... | |
 | Walter Burton Ford, Charles Ammermann - Geometry, Modern - 1923 - 406 pages
...as all drawn perpendicular to the line PQ at Q, in which case they all lie in the plane MN. 3. If a line is perpendicular to one of two parallel planes, it is perpendicular to the other plane also. Thus, in Fig. 179, if AB is perpendicular to MA', it is perpendicular to the parallel plane... | |
 | Walter Burton Ford, Charles Ammerman - Geometry, Plane - 1923 - 414 pages
...as all drawn perpendicular to the line PQ at Q, in which case they all lie in the plane MN. 3. // a line is perpendicular to one of two parallel planes, it is perpendicular to the other plane also. Thus, in Fig. 179, if AB is perpendicular to MN, it is perpendicular to the parallel plane... | |
 | David Eugene Smith - Geometry, Solid - 1924 - 256 pages
...parallel planes is called the distance between the planes. It has been shown (§ 56) that if this segment is perpendicular to one of two parallel planes it is perpendicular to the other. It will now be shown (§ 58) that the length is the same whatever perpendicular between the planes... | |
 | Education - 1905 - 684 pages
...angles of a quadrilateral are supplementary the quadrilateral can be inscribed in a circle. 9. Prove: If a straight line is perpendicular to one of two...parallel planes, it is perpendicular to the other also. 10. Prove: The volume of a circular cylinder is equal to the product of its base and altitude. ZOOLOGY.... | |
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Theorem: If a straight line is perpendicular to one of two parallel planes, it is perpendicular, also, to the other plane. 
