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Plane figures that have four straight sides; the two opposite sides are parallel, i.e., square, rectangle, rhomboid, and rhombus.

Related Terms

SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.

HORIZONTALLY POLARIZED WAVE

A plane polarized electromagnetic wave in which the electric field vector is in a horizontal plane.

HEXAGON

A closed plane figure having six sides

HORIZONTAL

Parallel to the plane of the horizon; perpendicular to the direction of gravity

INCLINATION OF AN ORBIT

1. See INCLINATION, definition 2. 2. As defined by the International Telecommunication Union (ITU), the angle determined by the plane containing an orbit and the plane of th

INCLINATION

1. The angle which a line or surface makes with the verti- cal, horizontal, or with another line or surface. 2. One of the orbital elements (parameters) that specifies the orientation of an orbit. It is the angle between the orbital plane and a reference plane, the plane of the celestial equator for geocentric orbits and the ecliptic for heliocentric orbits.

HYPOTENUSE

The side of a plane right triangle opposite the right angle; the longest side of a plane right triangle

FACE AREA

The total plane area of the portion of a grille, coil, or other items bounded by a line tangent

INTERSECT

To cut or cross. For example, two non parallel lines in a plane intersect in a point, and a plane intersects a sphere in a circle

ARGUMENT OF LATITUDE

The angular distance measured in the orbital plane from the ascending node to the orbiting body; the sum of the argument of pericenter and the true anomaly
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